This is a stencil eraser made by S.M.Z, a company highly trusted for drafting tools. Material: Stainless steel Purpose: Stencil eraser Use: To protect other characters when erasing a specific character with an eraser, preventing accidental erasure. The shape of the holes varies by company, and I bought this one after being recommended by a senior. Also convenient for pastel drawings, etc. It has been in my stationery drawer for many years. S.M.Z is Shimizu Seizuki Seisakusho (Shimizu Drafting Instrument Manufacturing Co.). The company has been reorganized and no longer exists. Rare for those who loved S.M.Z! The company name and logo on the bag are nostalgic! #Stationery #WritingInstruments #Eraser #Rare #S.M.Z #Drafting