Electromechanical

US$4.77
Economy chrome steel horseshoe magnet with keepers.
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US$5.53
This is a 3-terminal microswitch two pack, each equipped with a 17mm lever actuator. These switches have a great ‘clicky’ sound to them with a nice tactile feel and are perfect when used for a slider, 3D printer, or robot project. Each microswitch is rated for 5A at 250VAC.
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US$12.53
This particular SSR can switch current loads of up to 40A with a 3-32V DC input. Each one of these relays is equipped with four screw terminals (for use with ring or fork connectors) and a plastic cover that slides over the top of the relay to protect the terminals.
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US$8.67
Each pack contains ten 6" pieces of the following sizes: 3/32", 1/8", and 3/16".  You get three of each in black and red, and one of each in green, blue, white, and yellow.  It's a nice colorful mixed bag of heat shrink!
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US$2.09
SRUDH-SS-124D1 Relay 24V, 12A, SPDT Relay Coil : 24 VDC Contact : 12 A 120 VAC / 12 A 28 VDC S.P.D.T
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US$13.13
This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. It's made of plastic with sturdy plastic buttons. The keys are connected to a matrix so you only need 7 microcontroller pins (3-columns and 4-rows) to scan through the pad.
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US$6.82
These light-weight brackets (approximately 2.5 g each) are specifically designed for plastic gearmotors.
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US$6.78
These brackets are sold in pairs, and each bracket comes with two 1″ long and two 0.75″ long #2-56 screws for securing different size motors. 
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US$11.13
1.5" Alnico Bar Magents (Pair) with spacer and keepers. Supplied in cardboard boxes 38 x 11 x 6 mm.
Delivery within 2-3 weeks
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US$6.36
Candy bar style breakable magnets. 2" in length.
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US$11.93
Economy steel magnets with keepers. Individually packaged pairs.
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US$6.36
100 x 12 x 5 mm (approximate size). Chrome steel magnets. Perform a variety of activities and experiments involving magnetism. Low magnetic stregnth for careful experiments.
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US$6.36
150x12x5mm (approximate size). Chrome steel magnets. Perform a variety of activities and experiments involving magnetism. Low magnetic stregnth for careful experiments.
Delivery within 2-3 weeks
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US$13.63
An Alnico Horshoe Magnet in a cardboard box.
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US$30.63
Turn any surface/wall/table etc into a speaker with a surface transducer. This type of speaker does not have a moving cone like most speakers you've seen. Instead, a metal rod is wrapped with the voice coil.
Delivery within 2-3 weeks
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