Warranty and Return policy: Bearing Cups are made of 6061 T6 Anodized Aluminum Alloy Rubber Seals on Cup to ease noise problem, if they make it too tight, U can remove the seals Compatible with Frame 86.5 x 46mm(Frame inner diameter * Cup diameter) For BB 386 EVO frame Ceramics Bearing with O-ring Seals Information about Ceramics bearing: Bearing Material: Chrome Steel 52100 Ball Material: Nitrided Silicon Ceramic SI3N4 Enclosure: Two Seals Enclosure Material: Rubber Seal
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