exo waterproof abrasive cap is an innovative solution that combines a composite cap with an embankment of cosmetic corundum. a professional exo cap is made with the utmost care and the best materials available. the inner element of the cap is a composite that ensures durability and comfort of work. it is covered with cosmetic corundum not used in any other caps. white color gives the impression of cleanliness and hygiene.  in exo caps you will not notice "falling" of the abrasive! technical data: gradation: 220 - diameter of the cap: 13mm type of abrasive: corundum cosmetic - core: composite hard cap quantity in the package: 10 pcs. note! abrasive caps, size 13mm, should not work at higher revolutions than 10,000 / minute. at higher revolutions the micromotor may vibrate and its service life may be shortened. • Grit 60 - very coarse - for removing coarse calluses • Grit 80 - coarse - up to kernel removal • 150 grit - medium grit - for skin sanding • 220 grit - fine grit - for final surface smoothing