1、ALUMINUM OUTER FRAME: Bike bottom bracket set is made of aluminum alloy frame for slippy pedaling, noise reduction, light weight and high strength. 2、SEALED STEEL BEARINGS: Bicycle bottom bracket set is an integral sealed steel bearing, which prolongs the service life and is not easily damaged. 3、DUSTPROOF AND WATERPROOF: Bottom bracket set keeps the lubricant in the bearing, which is dustproof and waterproof and suitable for harsh riding environment. 4、NO LOOSENING EASILY: Bike bottom bracket spacer strengthens lateral stability, not easy to loosen, and rejects abnormal noise. 5、PRECISE MACHINING: Bottom bracket spacer is precise machined and has a high strength center shaft with good sealing performance, making it the perfect accessory. Item Type: Bike Bottom Bracket Set Material: Aluminum Alloy, Sealed Bearings Applicable Frame Tube Diameter: Approx. 41mm/1.6in 2 x Bike Bottom Bracket Set 1 x Spacer Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store