This 3pc Sabitori Rust Eraser set includes # 60 Grit , #120 Grit, #240 Grit Sabitori (Rust Eraser). Perfect size for those who want to try the products! The tsubaki oil is for high carbon steel knives. Apply 1-2 drops on each side of the blade and wipe with a soft cloth.This oil prevents rust and discoloration. The sabitori can be used to remove spot/rust stains on your knife. Follow the grain of your knife and rub gently. Use only on stain spots.