Provides superior performance to arbor bands and burs. Ideal for working on softer materials such as dentures and reline material. 5000 rpm. Does not damage the surface of the tooth. Must be used at 5,000 RPM so acrylics do not overheat. Coarse, medium, or fine options. Suitable for use with conventional polishing pastes. Hatho Miniature Scotch Brite is a unique polishing instrument that produces reliable results while being gentle with the tooth surface. This brush is recommended to be used at around 5,000 RPM for acrylics, so the material avoids overheating because of friction.Available in fine, medium, and coarse, each Hatho Miniature Scotch Brite pack comes with 12 brushes.