Alliance Rubber Envelopes #4, Self Sealing, Bubble Cushioned, 9 1/2" x 14 1/2" (ALL10806) Case of 25Bubble Mailers offer strong, air bubble protection. Ideal for mailing pictures, cassettes, jewelry and more. Tough outer layer provides stiffness and rugged durability. Water resistant design is lightweight for postage savings. No. 4 mailers feature a pressure sensitive strip closure. Simply peel away liner and seal. Envelopes are preprinted with "To" and "From" address lines. Each contains a high percentage of recycled paper. General Information