Made from rigid ABS plastic, these trolleys have accurately-aligned, very low friction wheels. Coupled with their low profile and accurate mass of 600g, this allows a range of kinematic experiments to yield high quality data. The two-position firing pins have a locking catch for safety and the trolleys have velcro pads for inelastic collision experiments. The trolleys are stackable and can withstand loads up to 60kg. Dimensions: 310mm (L) x 130mm (W) x 90mm (H).