Suitable for after replacement market SMOOTH OPERATION: Stable and smooth operation, good mute effect, practical and durable. The bearing is stable, low noise and long service life. STAINLESS BEARING STEEL MATERIAL: It is made of high quality stainless bearing steel material, rust and corrosion resistant. Product hardness, high precision, can withstand high speed, high load. HIGH PRECISION & HIGH HARDNESS: High precision, high hardness, high speed, high load, applicable for motors, toys, models, instrumentation, power tools, communication equipment, fitness equipment and other fields.