• These are the highest quality boards found anywhere!
• At 35-Mil, these provide greater protection than regular backing boards!
• Made from 100% acid-free, virgin wood, cellular fiber, 35 mil. thick cardboard.
• Contains a 3% alkaline buffer and a pH content of 8.0-8.5.
• Sold in packs of 50; Measures 8 5/8" x 11 1/2".