The Joytech SB Drive Unit is a reliable component compatible with most Joytech and Odyssey cassette hubs, as well as other generic hubs. It features a 9T x 14mm size and comes in a sleek black color. The drive unit includes a 4 pawl design and is made from chromoly, ensuring maximum strength and longevity. Enhance your bike's performance with this durable drive unit, built to withstand all your rides.