Helix Architects and Builders Template (37165) Incorporates basic symbols used by architects, builders, and contractors at scale of 1/4-Inch=1 Feet, and features title layout scale Made from dimensionally stable .03-Inch green transparent shatter resistant plastic, overall size 9 1/4-Inch x 5 1/4-Inch Designed for use with a 0.5mm lead or pen tip; ink risers on reverse side prevent smudging when using inking pen