Alvin - Flexible Stainless Steel Ruler - Cork Back - 18 inch - Flexible Stainless Steel Rulers by Alvin are made of finest quality stainless steel with non-skid cork backing that wonÆt slip on glass or polished surfaces. Alvin Stainless Steel Rulers are flexible enough to permit measuring curved surfaces. Raised edges eliminate ink blots and smearing. Permanent acid etched graduations wonÆt wear off. Graduated to 32nds, 16ths, and metric. 1.25 inches wide. 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.