Mounts Protect Your Stamps Mystic Mounts are a safe haven for your stamps – sturdy “envelopes” that gently surround your stamps. Mounts preserve your stamps and prevent damage from common threats like fingerprints, dust, creases and tears. Mystic Mounts are archival-quality, which means they’re made of the same material museums use to protect their philatelic items. Because they’re archival-quality, our mounts are acid free and contain no additives or softening agents. Plus Mystic Mounts don’t shrink or discolor over time – giving you years of service for pennies apiece!