The high quality pair of identical 300mm long wooden trolleys have three low-friction wheels, a strong spring plunger. This pair of identical wooden trolleys 300 mm long, mounted on three wheels. A spring loaded rod is fitted to give impulse when released. It has a provision for stacking the trolleys on top of each other with removable pins. Supplied complete with 3 elastic rings, 3 springs, 4 pins (for stacking), 2 rubber corks, 2 needles and 1 releasing pin.