Check the listing for details. Mylar 3" Right Triangle- 51 Piece Set - Quilting / Sewing Templates -. Condition: New. Listed at 27.23 USD. Mylar 3" Right Triangle- 51 Piece Set - Quilting / Sewing Templates - Made in the USA! Your browser does not support JavaScript. To view this page, enable JavaScript if it is disabled or upgrade your browser. 50- 14 mil thick Mylar Templates. 1 -1/8" Thick 3 inch Right Triangle Acrylic 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. Right Triangle Size is 3" along left side and bottom of seam allowance lines. This acrylic part of the set is 1/8" thick acrylic. Mylar is a trademark of DuPont Your browser does not support JavaScript. To view this page, enable JavaScript if it is disabled or upgrade your browser. quilting tools, quilting supplies