50 #4 (9.5″ x 14.5″) Self-Seal Poly Bubble Mailers Inside usable space – 9.5″ x 13.5″ Size may vary by 1/4″ on either side Wt per piece = .84 oz Self-sealing (peel and seal) Poly bubble-lined mailing envelopes from BubbleFAST. Poly (plastic) exterior with 3/16″ thick bubble lining. Made in the U.S.A. Popular size for shipping small hardcover books. Poly Bubble Mailers are: Water Resistant.   Tear Resistant    Tamper Resistant   Very lightweight. Save $$ on shipping your products without compromising on protection Thanks for shopping at Bubblefast Mark and Robin Le Vine