HeeYaa 5 Rows 2 Layers 10 PCS Nail File, Red Tough PP Core, Exquisite Kraft Paper Box, Double Sided 100/180 Grit Black Emery Board Manicure Pedicure Nail Tool

also i apologize for the excessive use of the word "maybe" up there. https://www.amazon.com/Professional-Double-Manicure-Pedicure-Buffering/dp/B07MV5772J/ these are 100/180 grit. 100 grit is rougher/coarser but still plenty safe to use for rough skin.$4 for 10 pieces.