This solid metal roller is designed for use with inclined plane experiments, weighing 400g with a width of 7cm and a diameter of 5cm. The roller runs on cone bearings for low-friction, consistent motion along an inclined surface. The roller is mounted in a metal frame with a provision for attaching a cord, allowing it to be connected to hanging masses or force measurement devices. Suitable for demonstrations and experiments involving gravitational acceleration, friction, mechanical advantage, and energy conservation on inclined planes.