White Coin Envelopes 4312 Western Sulphite, Size 7, 3-1/2 x 6-1/2", 28 Lb., Box of 500. The popular envelope for payrolls, parts, tips, seeds and instruction enclosures. Made of strong 28 lb 92 brite white sulphite material with heavily gummed flaps and open end. Packed 500 per box.