The #10 Envelope (4 1/8" x 9 1/2") in 30lb. Platinum Translucent is a Vellum, see-through envelope that makes for intriguing mailers. With archival properties, not only can these envelopes showcase an interesting mail piece, but they can also be used to store documents and photos. Crafed from 100% pure cellulose fiber without resins or other transparentizing agents. Translucent, recyclable, acide free, and elemental chlorine free. Seal by convenient adhesive strip along square flap. Available printed or plain.