Buffered Acid Free Tissue Paper. Archival quality. Use to store samplers, needlework, handmade lace, quilts, and other heirlooms. 3% calcium carbonate buffer. Minimum pH 8.5. Lignin free. Use with linen, cotton, jute, and paper products (cellulose and plant materials). Pack of 10 sheets measuring 24" x 36" each.