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- 4-inch diameter wheel with 8mm bore
- Tread material: Thermoplastic polyurethane
- Body material: Polycarbonate
- Coefficient of friction: 0.9 on carpet, 0.63 on FTC soft tiles
- Diameter: 4''
- Weight: 0.24 pound
- Bore: 8mm
- Bolt pattern
- 3.5mm holes on a 16mm circle (Inner)
- 6 holes around a 1.875'' circle (Outer)