This 4.9 x 9.8" rectangle of Light Seal Foam from Japan Hobby Tool is 0.059" thick and helps you easily repair worn down foam in compatible cameras. Light seals are commonly found in the back cover of film cameras and near the flip-up mirror of some SLRs, and proper maintenance of them is needed to prevent light leaks from altering your pictures. Thoroughly remove the old foam first, then simply cut the new foam into the proper shape and attach it on the same location. Application is simple thanks to the product's peel-off adhesive backing, which eliminates the need for a separate adhesive.