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This is a pack of 25 Kensington 11 x 14" Black Sheets of 4-ply Mounting Board from Lineco. They are manufactured from 100% select cotton fibers. These museum quality rag boards feature a 3% calcium carbonate buffer to guard against acid migration. The slightly alkaline pH level of 8.5 enables it to resist fading, discoloration, and embrittlement. It is the standard for museums and galleries. Ideal for both matting and mounting prints, watercolors, etchings, documents and letters. It features outstanding surface characteristics and cutting properties.