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J&T Bearing Tekno ET48 2.2 NMB Bearing Kit. The NMB bearing kit offers a balance of lifespan, value, and quality that can only be achieved with NMB bearings. This kit is a great "mid-grade" option between standard steel bearings and more expensive ceramic bearings. These grease filled bearings feature polished stainless steel balls, "TW" type nylon ball retainer, a combination of zero contact metal shields and rubber seals, with a true ABEC 5 rating.