... 4. Low noise 5.Long life 1.Products Details 2012 taper roller bearing 32907 ,chrome steel gcr15 H221647NA/K426864, ... ,2. Bearing Details Linqing Yuanyi(UJK) Bearing Factory1MaterialChrome Steel Gcr15 , Carbon steel Gcr11 , Stainless steel2Grease/OilGood quality3CageSteel , Brass , Nylon4RollerSteel5SealOpen ... . Bearing Pictures roller bearing sizes 31309 ,Chrome Steel Gcr15,Long life and low noise