Roller NO.: BSR60830-9Material: POM Shape: Round Inner Diameter: 8mmOuter Diameter: 30mmWidth: 9mmBearing NO.: 608ZBearing Size: 8x22x7mmLubrication: GreaseFeature: High Load, High Service life, Low noise, Smooth Running.Application: Rowing machines, Doors & Windows, Showcase, ... etc.8x36x10 mm Rower Rollers BS60836-10 OD 36mm POM Coated Rowing Machine Seat Wheel 8*36*10 Plastic Bearing Pulleys