One Inch Silicon Nitride Ceramic Bearing Ball Si3N4 G5 Grade 25.4mm Diameter Ultra Low Friction High Precision Ball for Bearings and Precision Cycling Projects Pro Grade Build Outer Diameter - 7mm 5201ZZE Nachi Double Row Angular

5201ZZE Nachi Double Row Angular Ball Bearing and bearing is Double Shielded

pair of ball bearings are 2 duplex bearings

7100" (Width)

PHS8 Bearings

One Inch Silicon Nitride Ceramic Bearing Ball Si3N4 G5 Grade 25.4mm Diameter Ultra Low Friction High Precision Ball for Bearings and Precision Cycling Projects Pro Grade Build Outer Diameter - 7mm 5201ZZE Nachi Double Row Angular1 Inch Si3N4 Ceramic Bearing Ball, G5 Grade 25. 4mm Diameter: 1 inch (25. 4 mm); Si3N4 ceramic, G5 grade, 1 ball This 1 inch loose ceramic bearing ball is made from silicon nitride (Si3N4). It's known for ultra light weight, high hardness, and very low friction, making it ideal for precision cycling components, high speed tools, and other demanding motion systems. Pack size: 1 ball Diameter: 1 inch (25. 4 mm) Material: Silicon Nitride Ceramic (Si3N4)