50mm mounts, 215 mm long strip for U.S. Blocks of 4 & Jumbo issues. 15 pieces per pack. Showgard mounts are center split across the back for easy insertion of stamp with a crystal clear front. Mounts are gummed with an exclusive formula to insure safe, firm adhesion to the album page. They make stamp collecting more enjoyable and at the same time protect stamp values. Choose Dark or Clear Background above.