This Kit includes 60 plastic gears which can be used as spare parts for motor gearboxes. Kit Contents: Single gear: 8 types, Spindle gear: 9 types, Double gear: 12 types, Pulleys: 7 types, Crown gear: 9 types, Blue motor gear: 2 types, Belt: 4 types, Sleeve: 4 types, Worm gear: 2 types, Rack: 1 type, Copper teeth: 1 type, Bevel gear: 1 type.