JAM Paper and Envelope s Translucent Vellum Envelopes are made from vellum paper which is made from pure cellulose fibers offering superior translucency without chemical additives and are recyclable. Made of 30 lb paper with a vellum finish these envelopes are more stylish than an average paper envelope. The booklet opening includes a V-flap with a gum adhesive for an easy and clean seal. The translucent envelopes offer an exciting sneak peek at its contents whether it is a party invitation or a greeting card. This pack of 25 is perfect for any and all occasions in which an exciting envelope is needed!