Light weight, high quality Korean emery board. This is also reusable (washable)!
Nail file grit guide:
80/80 – very sharp and rough, used for removing outer gel or acrylic overlays. Not recommended on natural nails.
100/100 – medium sharp and rough, used for preparing nail plate before applying gel or acrylic and for shaping artificial nails.
180/180 – less sharp and rough, for finishing off filing artificial nails. Recommended on natural nails.
240/240 – soft filing. Recommended on natural nails.