10 PCS FMFXTR Bicycle BB Middle Shaft Flying Wheel Cushion, Thickness: 1mm (Black)

1. Process: CNC + anode surface
2. Material: aluminum alloy
3. Use: for fine adjustment of the center shaft/freewheel base
4. Thickness: about 1/1.5/2/2.5/3mm
5. Size: inner diameter is about 35mm, outer diameter is about 42mm