Mohawk Skytone Vellum Parchment Envelopes Spring Green Shade #10 Commercial Flap 4-1/8 x 9-1/2 Inches, 24W (89 gsm), 500 Envelopes/Box (Sold as 1 Box) (M98603) #10 Commercial Flap Envelopes (4-1/8 x 9-1/2 Inches) 500 envelopes per box 24 lb Matching paper stock available Acid free for archival purposes