100 high-quality rigid backing boards to protect comics from bends and creases. - 100% certified acid free - Excellent volume and rigidity - Min. 26 pt. high bulk boards, less fibre - Min 7% calcium carbonate buffered - Full high quality front side coating - Precision cut & bright white finishing - Backing Board dimensions: 218 x 279 mm - 400 g/m² Backing Board weight - Made for long-term archival storage - Fits Ultimate Guard Magazine Size bags