The Wheels Manufacturing BB30 Bearing Kit includes (2) Enduro 6806 sealed bearings and 2 retaining clips. Features: Dimensions: OD: 42mm / ID: 30mm / Width: 7mm Direct replacement bearing for BB30 OEM systems ABEC-3 rated bearing with 5/32 Grade 20 balls, the largest in the industry 12% increase in static load rating compared to standard 6806 bearings Dual lip, groove type seals keep dirt out and 90% fill rate grease in Mobil HP 222 synthetic grease is long lasting and protects against contamination