F.O.X Metal Base + 50 Pack Replaceable abrasives are must have for manicurists who cares for the best customer service and safety of theirs customers. Replaceable abrasives has a soft layer, which makes the work process more convenient. Black color of abrasive. There are 100 grit, 150 grit and 180 grit options available. Designed to work with natural and artificial nails. 6 inch length. To use a removable abrasive, remove the protective film and stick it to the base. After use, dispose of the file and sterilise the base.