Designed for versatility, this pulley combination package is suitable for various DIY projects. The rubber belts and plastic pulleys are ideal for creating toy cars, science experiments, and other mechanical models. The sturdy materials ensure durability and consistent performance, making this set a valuable addition to any hobbyist's toolkit. Features -Color:Multi -Material:Plastic, rubber -Size:2.50X2.50X0.30cm/0.98X0.98X0.12in -Robust rubber belt: the rubber transmission belt is designed to be robust and wear resistant, ensuring a long time use -Smooth and quiet: the plastic pulley set reduces noise, providing smooth and quiet operation for your models -Convenient installation: these model accessories are easy to install and remove, making your diy projects more manageable -Multifunctional: this pulley kit is suitable for a variety of devices, offering versatile use for different projects -Enhanced stability: the stable transmission effect of this set improves the efficiency and performance of your mechanical setups Package list: 40 x pulleys 40 x rubber bands 4 x transmission belts