One layers of bias sisal sewed with two layers of cotton cloth, provides it good cutting and polishing properties, mainly used for pre-polishing metal ware.

They are two types of OS:
A. With dip treatment in special resin; harder buff, better cutting power, extremely long service life, self-cooling druing operation.
B. Without dip treatment in special resin, softer buff, saving polishing compounds, self-cooling during operation.

Diameter: 100 - 500mm
Width: 15 - 25mm
Hole: as your requested.