Helix Large Circle Template (37169) 10 circles (1 1/2-Inch, 1 3/4-Inch, 1 7/8-Inch, 2-Inch, 2 1/4-Inch, 2 1/2-Inch, 2 3/4-Inch, 3-Inch, 3 1/4-Inch, 3 1/2-Inch) and 4 radii (1/2-Inch, 5/8-Inch, 3/4-Inch, 1-Inch) Made from dimensionally stable .03-Inch green transparent shatter resistant plastic, overall size 6 3/4-Inch x 7 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