1601ZZ Ball Sealed Bearing is regular section, double Shielded, radial and deep groove ball bearing,1601ZZ bearing is made of Chrome Steel with chrome steel balls and steel cage,bearing is closed with Metal Shields to protect the bearing from dust or any possible contamination,1601ZZ bearing is Shielded and self lubricated,the quality is set to EMQ (electric motor quality) to ensure high speed,1601ZZ bearing is lubricated with grease.