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Made of lignin-free black cellulose fiber board for both purity and strength.
- Acid-free with a pH of approximately 8.5
- Buffered with approximately 3% calcium carbonate to retard the effects of migrant acidity
- Strong, durable 60-point thinness board
- Metal edged construction for lasting protection
- Inside dimensions: 12-1/4" x 10-1/4" x 5"