3M Polishing Papers are made from micron sized abrasive particles, slurry coated onto a non-woven synthetic backing. They are soft, cloth-like and paper thin, so wraps smoothly around your piece. You can also wrap the paper around a wooden stick, if you only want to polish the raised surfaces on your piece, for instance, if you have oxidised the piece. The precision micron grading provides a uniform, consistent finish. These are sometimes referred to as Tri-M-Item papers. They really give you the most fantastic mirror like finish on metal clay and silver. I mainly keep these for use on the fired silver, as the clay clogs them up too fast. Each sheet is 8 1/2" x 11" or 216x279mm. The set includes 2 of each of the following sheets: Light Green - 1 Micron, Mint - 2 Micron, Pink - 3 Micron, Blue - 9 Micron, Grey - 15 Micron, and Green - 30 Micron.