Alvin - Plastic Bevel Architectural Scale XP - 12 inch - Alvin Plastic Bevel Architectural Scale XP is a 12 inch two-bevel white scale made of high-impact plastic. Engine divided graduations. Supplied in vinyl pocket sheath. 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.