Boss Bearing 41-0049BP-8I3-B Premium Rear Wheel Bearings and Seals Kit Kawasaki ZX900 Ninja ZX9R 1998 1999 Kit Contains: 3 Bearings and 2 Seals All Bearings feature low-drag double lip rubber seals on both sides. Double sealed bearings outperform metal shielded bearings because they keep out dirt and water. All Seals are double lip and rubber encapsulated with internal stainless garter spring for maximum sealing performance. A FREE helpful installation tip sheet will be included in all wheel and axle kit purchases.