Tropical Shine 7.5 White Lightening Medium/Fine 180/240 Grit 50 pack " by Tropical Shine. $55.00. size: 7 1/2" x 3/4". Medioum 180 grit and fine 240 grit. Pack of 50. Washable and disinfectable. Medium grit- for medium sanding on acrylic nails and filing nail edge on natural nails. Fine grit for final finishing on acrylic nails and filing nail edge and removing ridges on natural nails. May be used with silk wraps.