Campagnolo ProTech Bottom Bracket - English, OutboardCampagnolo ProTech bottom brackets feature a patented external sealing ring design that protects a strong, resilient fiberglass charged polyamide central tube from the harmful ingress of water, mud and grit. Please note the bearings are sold separately. Designed specifically for gravel riding and racing to protect against water, mud & grit *Please note that Campagnolo ProTech bottom brackets DO NOT include bearings and are sold separately Product