Alvin - Stainless Steel Erasing Shield - Alvin Stainless Steel Erasing Shields are made of high quality .005 inch flexible stainless steel with 26 precision tooled apertures. Use the Stainless Steel Eraser Shield for precise and controlled erasing. Polished finish resists tarnishing. Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Creative Coldsnow is a pround retailer of Alvin graphic arts, drafting and fine arts products.