50- 14 mil thick Mylar Templates. 1 -1/8" Thick 1 inch High Half Hexagon Acrylic Template Markings are laser engraved for long lasting use. Each Mylar piece is conveniently engraved with it's size for easy identification. Mylar pieces are sized to fit inside the acrylic template. Just cut your material around the Acrylic template and you are ready to sew around the Mylar. Mylar is heat resistant, use a household iron on low. Remove the Mylar with the hole after sewing. Use over and over! This Acrylic does have the 1/4" seam allowance and Guideline Holes. Hexagon Size is 1 inch high along seam allowance lines. Will match up to our 2 inch side to side Hexagon, 2 inch diamond, and 1 inch equilateral triangle. This acrylic part of the set is 1/8" thick acrylic. Mylar is a trademark of DuPont quilting tools, quilting supplies hexi