+ These stems are cold-forged 6061 alloy for maximum strength and CNC’d for weight reduction and style. The bolts are moved to the side for a knee-friendly design and to save weight. Flight stems also have serrated face plates which increase the holding power by 20%! Laser etched Falcon logo. 50mm, 55mm & 60mm extensions. Only 8.6oz / 243g (55mm)