Track and Wheel Set offers a large degree of adjustability and creativity in the design of tracked vehicles. Includes two pieces each of three track lengths (5/8 wide x 7-7/8, 2-3/4 and 2-1/8 inches long); two 1-1/4 inch drive sprocket wheels; two 1-1/4 inch idler wheels; six 7/8 inch road wheels; two 7/8 inch drive sprocket wheels; five 3mm dia. x 100mm long shafts; one hex drive shaft; ten self-tapping screws. Use with a variety of Robotics products; connect in a variety of combinations. Tamiya no. 70100.