Mylar 1" Flattened 90&deg; Hexagon 51 Piece Set - Quilting / Sewing Templates 50- 14 mil thick Mylar Templates. 1 -1/8" Thick 1 inch Flattened 90 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. Acrylic Measures 1 inch from corner to corner from the seam allowance lines. Piece has seam allowance and guideline holes. Mylar pieces each have 1" sides. Just cut your material around the Acrylic template and you are ready to sew around the Mylar. -Mylar is a trademark of Dupont