Product: This is a Pulley Set and Bracket with Base, good for middle school and high school physics experiments. Material: The pulley block set made of metal, this pulley set and bracket is designed to withstand repeated use in the classroom or lab setting. Features: The pulley block base ensures stability during use while the pulley system allows for a variety of mechanics based experiments, making it an essential tool for any science education setting. FunctionAn essential physics experimental equipment for students and teachers, great for teaching mechanics effects in physics. Can be used to demonstrate the principle of pulleys and how they work in real machines. Wide ApplicationGreat for home, school or lab use. Also ideal Birthday and Christmas gift for kids, children in elementary and middle school, can enjoy DIY experiments fun while learning basic physical science knowledge. Specification: Material: Metal Size Chart: 14cmx8.5cmx37.5cm/5.51inchx3.35inchx14.76inch Package Includes: 1 Pulley Block Physics Experiments Kits Note: Please allow slightly errors 1-2cm differences due to manual measurement.