Red Coin Envelopes 4151, Starburst Coins, Size 5-1/2, 3-1/8 x 5-1/2", 24 Lb., Pack of 25. The popular envelope for payrolls, parts, tips, seeds and instruction enclosures. Made of strong 24 lb sulphite Starburst Paper with heavily gummed flaps and open end. Flaps require moistening to seal.