Features: This motorized metal desktop conveyor belt delivers precise friction measurements for physics experiments. Built with metal plastic composite construction and modular assembly design, the equipment withstands repeated classroom use. Ideal for school students and educators, this lab tool simplifies friction concept demonstrations in physics classrooms. Perfect for dynamic/statics friction comparisons, dynamic energy demonstrations, and force measurement labs. The conveyor systems engineered with safety focused overload protections and nonslip rubberized edges. Specifications: Materials: Metal, Plastic Color: As The Picture Shows Package Weight: approx.3200g Size: approx.12x50cm/4.72x19.68in Package Includes: 1 Set of Electric Conveyor Belt note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!