Hybrid Ceramic R6ZZ Ball Bearing 3/8" x 7/8" x 9/32" - ABEC-5R6ZZ Ceramic Hybrid Ball Bearing ABEC 5 3 8" ID x 7 8" OD x 9 32" Width Stainless Steel with Si3N4 Balls Shielded The R6ZZ is a high performance hybrid ceramic bearing featuring stainless steel races and silicon nitride (Si3N4) ceramic balls. With an ABEC 5 precision rating and dry lubrication, its designed for high speed, low friction performance in tools, 3D printers, motors, and demanding applications. Pack size: 1 bearing Inner diameter: 3 8" (0.