For polishing stones with water, made of resin, diamond powder, etc....................................................... Detailed Product Description Diamond Flexible Polishing Pads, wet pads DiameterThickness (mm) ... Buff41002.5/3.051252.5/3.0For all kinds of stones, concrete, ceramics, glass, we approved by ISO9001:UQ100566RO ... time. Best regards, Ms Evelyn Chan Diamond Flexible Polishing Pads