Features: 1) Our EMQ bearings (single row deep groove ball bearings) can reach the accuracy grade of ABEC3 (P6) and ABEC5 (P5), ZV3. They are suitable for high speed, high precision, low friction and low noise operations, such as household appliances, office equipment, electric appliance, electronics equipment, optical instrument, medical instrument and others. 608, 6200~6208, 6300~6308, 693 are strongly recommended 2) Our high-speed & precision bearings mainly referred to matched angular contact ball bearings at ABEC7(P4) and ABEC5 (P5). They have characteristics of high rotary precise and high dimensional precision, suitable for high-speed operating, like applying for motor spindles, high-speed tool machinery and precise measure equipments. Their cages are mainly made of phenolic laminated resin or glass-fiber reinforced polyamide 66