Hira-To PSA self adhesive genuine replacement discs COMPLETE SET. One of 80, 60, 30, 15 & 9 micron These are PSA (self adhesive) discs. £11.25 Quantity: at £11.25 each Add To Basket These are PSA (self adhesive) discs. Price is for a set of five discs. One of 80, 60, 30, 15 & 9 micron It is important to change these at regular intervals to prevent overheating. We normally change every 20-30 pairs of scissors sharpened.