Alvin - Ship Curve Set of 6 - Clear - The Alvin Ship Curve Set features a set of six ship curves made of clear 0.06 inch thick plastic with finished edges. Sizes range from 6+ inch to 24 inch. Packaged in a poly bag with hang hole. 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.