This product is a wheel set for road bikes, time trial/triathlon bikes, and racing bikes. It includes two items: Shimano 600 Tricolor hubs and Mavic Open 4 Cd rims with Wheelsmith 8-speed 12-23 cassette. The wheel size is 700C and the brake type is rim brake. The valve type is Presta and the tire type is clincher. The material used is aluminum and steel. The product is made in France and has a multicolor finish. True and smooth