Double Sided Rubber Seal: The bearings are equipped with rubber seals on both sides to effectively prevent dust and moisture from entering and extend bearing life and maintain optimal performance. Chrome Steel Material: Deep groove ball bearings are made of chrome steel which has excellent strength, hardness, abrasion resistance and corrosion resistance. Withstands critical radial and axial loads and provides reliable support for a variety of applications. Features: This ball bearing is a level of P6 (ABEC3) accuracy and is suitable for most common applications. The Z2 noise level produces low noise during operation and is suitable for applications requiring a quiet work environment. Wide application: widely used in various mechanical and precision equipment, such as motor, mold manufacturing, automation equipment, etc. It is also suitable for industrial machinery, electric tools, and household appliances. CHOOSING GUIDE: Open type (no suffix) - Suitable for high speed and super fast driving. Shield (suffix Z/ZZ) - High Speed Protects against dirt and foreign objects Shield (RS/2RS) - Made of sheet steel nitrile butadiene rubber (oil and liquid resistant). Lower speed than metal sealed bearings. Specifications: Model: 6701-2RS Seal Type: Double Seal Material: Chrome Steel (GCr15) Cage Material: Metal Dimensions: 12x18x4mm/0.47"x0.71"x0.16"(Inner Diameter x Outer Diameter x Thickness) Accuracy Level: P6(ABEC3) Noise Level: Z2 Package Includes: 10pcs Deep Groove Ball Bearings