full-backs 'silver & golden age' 42-mil backing boards & mylites 2 'silver & golden age' 2-mil comic book mylar sleeves - 50 of each! by e. gerber e. gerber <p><strong>full-backs:</strong> these are the highest quality boards found anywhere! at 42-mil, these are twice as thick as regular backing boards! made from 100% acid-free, virgin wood, cellular fiber, 42 mil. thick cardboard. contains a 3% alkaline buffer and a ph content of 8.0-8.5. sold in packs of 50. measures 7" x 10 1/2". </p><p><strong>mylites 2:</strong> the best raw plastic material available for permanent protection and storage! at 2 mil, these are twice as thick as ordinary mylites! they are resistant to aging, decomposition, moisture, oxygen, and gas penetration; not affected by fungus, mold, or mildew; and immune to insect and rodent attack! sold in packs of 50. measures 7 1/4 x 10 1/2 plus 1-1/2" fold- over flap.</p>