1.Deep groove ball bearings 6303 2.With low noise and high speed limit 3.Moq:5000 pieces 4.Material:GCr15,9Cr18,Chrome steel 1.Material: GCr15,9Cr18,Chrome steel2.Quality standard: ISO9001:20083.Precision standard: ABEC-14.Shield type: Open, Z, ZZ, RS, 2RS5.Feature: Low noise,good quality,suitable for high speed6.Application: micro-motor, household appliance, automobile, telecommunication ...