BevelGearFactory High performance plastic bevel gear with excellent quietness due to coniflex teeth form, and can be used without lubrication. The positive characteristics of plastic bevel gears include being lightweight, non-rusting, quiet, injection molding enabling low cost and large production, and able to operate without lubrication by mating with metal gears. For the plastic bevel gears, we can you have any needs on the gears. 聽BevelGearFactory website:http://www.tjondgear.com/gear/bevel-gear/