Crystal clear Archival Mounting Corners allow safe mounting of photographs, postcards, ephemera, clippings, letters, prints or almost any paper item. Archival Mounting Corners are pre-scored for speedy application and are made of archival polyester. The self-stick adhesive is 3M's 415 tape, one of the few institutionally recognized tapes. Available in 0.875'' size, these corners offer an easy and practical means of archival mounting. No seams to split. Price per box of 100 corners.