Description: 【Material】: The physics experiment pulley set is made of metal and is designed for repeated use in a classroom or environment 【Features】: The pulley block bases ensures stability during use, while the pulley system allows for a variety of mechanics based experiment, learning fixed pulley, movable pulley 【Function】: This is a necessary physics experiment equipment for students and teachers, great for demonstrating the principles of physical mechanics 【Wide Application】:Educational science experiment is ideal for home, school or use 【Great Gift】Pulley Block Physics Experiment is also an ideal birthday gift for primary and secondary school children Specification: Material: Metal   Size Chart:bracket 40cm/15.75inch Package Includes:4 Pulley set 1 Bracket 10 Hook code(50g) 2 Hook wire Note: Please allow slightly errors 1-2cm differences due to manual measurement.