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1078-POLOLU Universal Aluminum Mounting Hub for 3mm Shaft, #4-40 Holes (2-Pack)
US$8.33
These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 3 mm diameter motor shafts. The set includes two hubs, two #4-40 set screws for securing the hubs to motor shafts, and one 0.05″ Allen wrench for use with the set screws. Each hub has four threaded mounting holes for #4-40 screws (not included).
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1996-POLOLU Universal Aluminum Mounting Hub for 3mm Shaft, M3 Holes (2-Pack)
US$8.33
These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 3 mm diameter motor shafts. The set includes two hubs, two M3 set screws for securing the hubs to motor shafts, and one 1.5 mm Allen wrench for use with the set screws. Each hub has four threaded mounting holes for M3 screws (not included).
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2673-POLOLU Aluminum Scooter Wheel Adapter for 5mm Shaft
2673-POLOLU Aluminum Scooter Wheel Adapter for 5mm Shaft
US$8.57
This two-part aluminum assembly mounts directly to 5 mm diameter motor output shafts like those on many of our stepper motors and allows you to drive most scooter, skateboard, inline skate, and other common wheels that are compatible with popular 608-series ball bearings.
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4405-POLOLU QTRX-HD-05A Reflectance Sensor Array: 5-Channel, 4mm Pitch, Analog Output, Low Current
US$8.62
This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features high-performance, low-current QTRX sensors with lenses.
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4305-POLOLU QTRX-HD-05RC Reflectance Sensor Array: 5-Channel, 4mm Pitch, RC Output, Low Current
US$8.62
This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features high-performance, low-current QTRX sensors with lenses.
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2258-POLOLU Steel L-Bracket for NEMA 23 Stepper Motors
US$8.63
This coated steel bracket lets you securely mount typical NEMA 23-size stepper motors to your project. The bracket features two slots for various mounting solutions and includes four M4×16mm screws, washers, and nuts for securing the motor to the bracket.
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956-Pololu Pololu Ball Caster with 1" Plastic Ball
956-Pololu Pololu Ball Caster with 1" Plastic Ball
US$8.82
The height of the assembled kit ranges from 1.1" to 1.4". Dowel pins are used to minimize the friction between the ball and the ABS housing.
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Pololu Wheel for Standard Servo Splines (25T, 5.8mm) - 70×8mm, Black, 2-Pack
US$8.82
These black plastic wheels have silicone tires and measure 70 mm (2.75″) in diameter. They mount onto standard servo splines with 25 teeth and a 5.8 mm diameter, such as the splines on FEETECH’s FS5106R and SpringRC’s SM-S4303R continuous rotation servos. This product is a pair of wheels.
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3674-POLOLU, Right Bumper Switch Assembly for Romi/TI-RSLK MAX (Through-Hole Pins Soldered)
US$9.05
The 3674-POLOLU is a bump sensor for the Romi or TI-RSLK MAX robots. It uses six snap-action switches to determine if there's an obstacle on its way or not.
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1079-POLOLU Universal Aluminum Mounting Hub for 3mm Shaft, #2-56 Holes (2-Pack)
US$9.51
These universal aluminum mounting hubs allow you to mount custom wheels and mechanisms to 3 mm diameter motor shafts. The set includes two hubs, two #4-40 set screws for securing the hubs to motor shafts, and one 0.05″ Allen wrench for use with the set screws. Each hub has four threaded mounting holes for #2-56 screws (not included).
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750-POLOLU Pushbutton Power Switch SV
Pushbutton Power Switch SV
US$9.73

It is a patented design initially created for the POLOLU Orangutan Robot Controllers as an alternative to bulky mechanical switches.

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1531-POLOLU Pololu RP5/Rover 5 Expansion Plate RRC07A (Narrow) Solid Black
1531-POLOLU Pololu RP5/Rover 5 Expansion Plate RRC07A (Narrow) Solid Black
US$9.73
This is a black narrow expansion plate for the Rover 5 tracked chassis and is made of 1/8" (3mm) acrylic.
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2692-POLOLU Ball Caster with 1″ Plastic Ball and Ball Bearings
US$9.73
This ball caster uses a 1″ diameter plastic ball and has an overall height of 1.1″ (29 mm). The two-part housing snaps together to securely enclose the ball and three ball bearings that minimize friction between the ball and the ABS housing. The base piece of the housing has holes for three #4 or M3 screws (not included).
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4209-POLOLU QTR-HD-09A Reflectance Sensor Array: 9-Channel, 4mm Pitch, Analog Output
US$9.76
This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.
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4109-POLOLU QTR-HD-09RC Reflectance Sensor Array: 9-Channel, 4mm Pitch, RC Output
US$9.76
This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 40 mm. This version features the traditional-style QTR sensors without lenses.
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