Mylar 1" 90 Degree Flattened Hexagon- 51 Pce Set 51 Piece Set 50- 90 Degree Flattened Hexagons- 1- 1 inch side 1/8" 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. These are sized to fit our 1 in squares. Make "Patchwork of the Crosses" Quilt and other designs. 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. Acrylic Hexagon Size is 1" along the seam allowance lines. This acrylic part of the set is 1/8" thick Mylar is a trademark of DuPont quilting tools, quilting supplies Listing and template services provided by inkFrog Open.