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Features: 1. CNC machined aluminum alloy cups, sturdy, lightweight and high-precision. 2. Corrosion-resistant ceramic bearings, lighter and more durable than steel ones. 3. Electroplated coating with metallic luster, aesthetic and fadeproof. 4. Sealed cartridge bearings, water- and dust-proof. 5. Directions clearly marked for easy installation. 6. Compatible with Shimano and FSA crankset systems.Specifications: Quantity: 1 Brand: MIFIR Color: Black/Blue/Red/Purple/Green/Gold/Silver Bearing Cups are Made of 7075 Anodized Aluminum Alloy Fit with many cranksets: Shimano,Raceface& FSA Bearing Material: Chrome Steel Size: 68-73mm BCI37-24T Weight: 113.5g Package including: 1 pcs MIFIR Bottom Bracket