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S6701-2RS Hybrid Ceramic Bearing 12x18x4mm Sealed Thin Slim Bearing Inner Diameter - 2 1/2 inch (2.5") inner and outer races areS6701 2RS Ceramic Sealed Ball Bearing Thin Slim Series 12mm x 18mm x 4mm Stainless Steel with Ceramic Balls, Sealed The S6701 2RS is a high precision thin section ball bearing featuring ceramic balls and stainless steel construction for durability and corrosion resistance. Designed for compact applications, it comes pre lubricated and sealed with rubber on both sides, making it ideal for high speed, low friction environments such as robotics, 3D