Helix Combo Circle Template (37163) 45 circles in 1/32-Inch increments from 1/16-Inch to 2 1/4-Inch Made from dimensionally stable .03-Inch green transparent shatter resistant plastic, overall size 6 1/2-Inch x 11-Inch Designed for use with a 0.5mm lead or pen tip; ink risers on reverse side prevent smudging when using inking pen