The plastic pulleys are suitable for a wide range of science projects and classroom activities. They are designed to be used in experiments that require lifting and moving objects, providing a practical demonstration of mechanical advantage. These pulleys are an essential tool for any physics lab or education setting. Features -Color:Blue -Material:Plastic -Size:11.50X4.00X3.00cm/4.52X1.57X1.18in -Size:8.00X4.00X3.00cm/3.14X1.57X1.18in -Easy handling: this pulley set is designed for simple use, making it great for physics and mechanics experiments in education settings. -Reduced friction: the plastic material ensures minimal friction, providing a smooth and precise sliding experience during experiments. -Compact and portable: lightweight and easy to carry, this pulley set is ideal for use in labs, classrooms, and at home. -great and reliable: made from sturdy plastic, these pulleys offer excellent durability and resistance to wear, ensuring longterm use. -Versatile use: available in two specifications, this pulley set meets various experimental needs, making it suitable for different education activities Package list: 5 x pulley (double) 5 x pulley (single)