Mylar 4" Hexagon (Side to Side Measurement) 51 Piece Set - Quilting / Sewing Templates You get 51 Total Pieces. 50 Mylar and 1 Acrylic Template. 50 - 14 mil thick Mylar 4" (measured side to side) Hexagon Templates. 1 -1/8" Thick 4 inch Hexagon Acrylic Template. Each mylar piece is conveniently engraved with it's size for easy identification. Mylar pieces are sized to fit inside the acrylic template. Can be ironed with low setting. Just cut your material around the Acrylic template and you are ready to sew around the Mylar. -Mylar is a trademark of Dupont This shape seam allowance lines match up with our 4" Diamonds and 2" High equilateral triangles.