The PF30 standard is widely used. To make it compatible with Shimano and other 24mm diameter thru-axle cranks, as well as improve the system, select this bottom bracket.The package comes with two cups and CeramicSpeed Bearings installed. There are two options. Both Standard and Coated Bearings feature super smooth CeramicSpeed Balls and hardened-steel races. The CeramicSpeed Coated Bearings have an additional feature: a 3-micron thick metallic layer over the races. This addition makes the races smoother and harder, lowering drag and increasing life.In The Box:1 bottom bracket with bearings installed.,2 dust covers.,10ml syringe of All Round Grease.,Sticker sheet..