Durability: The physics experiment pulley set is made of metal and is designed for repeated use in a classroom or environment. This sturdy construction ensures the life and durability of the productSize: The pulley system physics experiment size is 15cmx9.5cm for the base and 33.5CM for the heightFeatures: The pulley block bases ensures stability during use, while the pulley system allows for a variety of mechanics based experiment, making it an essential tool in any scientific education environmentFunction: This is a necessary physics experiment equipment for students and teachers, great for demonstrating the principles of physical mechanicsWide Application:Educational science experiment is ideal for home, school or use. It is also an ideal birthday gift for primary and secondary school children Specification: Material: Metal Size Chart: Base: 15cmx9.5cm/5.91inchx3.74inchHeight: 33.5cm/13.19inch Package Includes: 1 Pulley Block Physics Experiments Kits Note: Please allow slightly errors 1-2cm differences due to manual measurement.