Hero Arts CL611 Photopolymer Stamps, Clear Stamps Set - Many Birthday Messages COLOR LAYERING - Expand your creativity using these Birthday Messages clear stamps. Mix and match for a stunning look on your designs EASY POSITIONING - Peel off your clear stamps from its backing and stick to any acrylic block making for easy positioning. Simply apply your favorite ink and stamp crisp clear images PREMIUM QUALITY - Clear stamps are made with premium American-made photo-polymer, which is non-toxic, biodegradable and phthalate-free EASY CLEAN - Clear stamps are easy to clean. You can use clean water or a stamp cleaner. Store and keep it dry HERO ARTS IS A GREEN BUSINESS - Hero Arts is a Certified Green Business and an award-winning sustainability leader. Made in the USA