Makeblock plastic timing pulley 62T is made of plastic, which has a lighter weight. It is used as a car's wheel in DIY designs. Moreover, 12 M4 holes in it also allow to be used as the plate in Makeblock platform.
 
Features:
Made from plastic.
62 tooth timing pulley with a step diameter of 10*7.5mm.
Compatible with MXL Timing Belt.
Can be used with TT Motor.
Can also be used as a car wheel. 
with 12 M4 holes
Sold in Packs of 4.