50- 2 inch Mylar Half Hexagons 50 4 inch Mylar Half Hexagons. 1- 2 inch acrylic Half Hexagon 1- 4 inch acrylic Half Hexagon. 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 templates. Just cut your material around the Acrylic templates 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 is 14 ML material. These Acrylic pieces do have the 1/4" seam allowance Guideline Holes. 2" Half Hexagon Size is 1 inch along seam allowance lines and 2" along bottom seam allowance line. 4" Half Hexagon is 2" along seam allowance lines and 4" along bottom seam allowance line. This acrylic part of the set is 1/8" thick acrylic. Mylar is a trademark of Dupont quilting tools, quilting supplies hexi