Proofgrade® Eco Iron-On material comes in flat 12" x 12" sheets and makes it easy to bring brilliant colors and personal designs to tote bags, T-shirts, pillows, hats, mugs and so much more! Proofgrade Eco Iron-On is a chlorine-free alternative to heat transfer vinyl that’s lab tested for creating perfect prints at home with your Glowforge. Each sheet ships flat to avoid curling and is digitally encoded for perfect print results, every time.Your laser is like a microwave - putting in the wrong materials will ruin it, instantly. For your peace of mind, Proofgrade Eco Iron-On is lab tested for creating perfect prints safely at home. Lasts for more than 50 washes on cotton, linen, wool, uncoated polyester, cotton polyester blends, and acrylic blends. Details: Includes assorted shimmer colors 12" x 12" (30.48cm x 30.48cm) sheet size 3 sheets Shimmer finish For use on most fabricsFor use with Glowforge machines