This is a Yeah Racing Universal Shaft Set 38mm For HPI Sprint 2, a must have upgrade to replace the stock plastic parts for smoother and more direct acceleration and deceleration. The Shaft is made from lightweight yet durable high quality steel and is designed to have minimum possible flexing areas and friction. When used on the front more power can be transferred to the Front wheel for accelerating and turning. This Steel Universal Joint Shaft can be used for both front and rear for HPI Sprint 2.