Mirka’s Pressure Sensitive Adhesive (PSA) sticky backed discs are constructed with a flexible backing which makes these discs excellent for your work shop or even professional use. The stearate coating minimizes clogging, pilling and loading of the sanding discs when being used. The sticky back discs work on most 5” or 6” random orbital sanders and may be used free handed as well. The Mirka discs are recommended to be used for dry sanding applications only. The Mirka Pressure Sensitive Adhesive sticky back rolls come in package counts of one hundred and have perforated ends for easy disc separation. The discs are available in 80x, 100x, 120x 150x, 220x, 320x, and 400x packs.