Bottom BracketAll products of Bottom Bracket BB90/BB95 (TREK ONLY) Next » Model No EMA-BB-Sxxx Catalogue Non-Thread (Press Fit) BB Key Features Grade5 Si3N4 Ceramic ball, light weightNon-contact rubber seal, lowest friction. Kluber NB52 grease (Ceramic), best corrosion protectionPart No.#EMA-BB-S003: Ceramic Bearing with plastic capEMA-BB-S005: Steel Bearing with plastic cap Made inTaiwan, Republic Of China