Ball Bearing 6 x 13 x 5 NMB (4pcs)
Mugen Seiki is now offering high-performance NMB 6mm x 13mm x 5mm bearings. The NMB bearings use steel shields and light oil to reduce friction to make your drive-train more efficient. The NMB bearings are also more durable then stock rubber sealed bearings. This bag contains 4 bearings.