... Peel and seal Main material: Paper Material weight: 80 GSM Internal opaquing non-opaque Seams: Inside Window/plain: Window Professional manufactuer ... envelope, printing envelope, wallet envelope, pocket envelope, window envelope, gummed envelope, peel and seal envelope Stock size: C7, c6, c5, ... , dl, 150x150, 145x145, 130x130, #10, mini Customer size and sample processing are welcome Competitive price ...