Made of oriented polystyrene, containing no agents that might be harmful to postage stamps. Special foil will not shrink or discolor, is 100% waterproof and is proven safe for stamps. Showgard’s functional design keeps stamp securely in position while permitting free passage of air around the stamp. Showgard mounts are America’s favorite stamp protection. Available with Black or all Clear Backs. Showgard Mounts are pre-gummed on the entire back. Moisten top half lightly and affix on page.