STOCK PLASTIC GEAR.

Are you wanna build your own robot / DIY project with unique mechanical design? At Gizmoszone, a wide variety of plastic gears here may help you;

Motor gears;
PDF Datasheet

Spur gears;
PDF Datasheet

Compound gears;
PDF Datasheet

Worm gear pairs.
PDF Datasheet

All of these plastic gears made of acetal resin, providing a good bending strength, low friction, low noise level and outstanding anti-organic properties.