#6 12.5" x 19" White Kraft Mailing Envelopes Padded Bubble Book Mailers Self Adhesive Bag 50 Pieces Color: White, Recyclable: Yes. Paper Liner: White, Low cost Shipping Protection. Usable Dimensions: 12.5 x 18, Outer Size: 13.5 x 18 + 1.57. Lip Size: 1.5 +/- , Bubble Lining: 3/16. Adhesive: Synthetic rubber  Hotmelt,  minimum +/- 1/8.