High Quality Felt Disc: 1.Corner grinding (sanding) 2.Good surfece treatent ... advantages: 1, cooling rapidly, the high-speed abrasive-resistant. 2, high wear resistance and high flexibility. 3, grinding ability, and the Silk Road even clear ... without leaving any residue, or black discoloration 6, the dust of small, non-pollution. 7, safe and without noise. High Quality Felt Disc