Skytone Pewter Envelopes – A6 (4 3/4 x 6 1/2) 60 lb Text Vellum 250 per Box. Mohawk Fine Papers Skytone. A6 Envelopes. Our 11,000 Sq. Sizes include: 8-1/2″x11″, 8-1/2″x14″, 11″x17″, 17″x22″, 23″x35″, 25″x38″, 26″x40″, in all most available weights (starting from 20lb. ).