Four different size tire diameters and two different size wheel hubs. Tire size is printed on tires for easy reference.
Features
(6) Small Wheel Hub
(4) Large Wheel Hub
(4) 20mm Diameter Pulleys
(4) 100mm Travel Rubber Tire
(4) 160mm Travel Rubber Tire
(4) 200mm Travel Rubber Tire
(4) 250mm Travel Rubber Tire