These solid metal rollers are designed for use with an inclined plane in physics experiments. Each roller weighs 1 kg and measures 8 cm wide with a 4.3 cm diameter. The rollers run on cone bearings for smooth, low-friction motion and are mounted in a metal frame with provision for attaching a cord. The apparatus supports demonstrations and experiments involving friction, acceleration on inclined surfaces, and the relationship between mass, angle, and rolling motion.