Western Sulphite Coins 3904 #1A Envelopes 2-1/4 x 3-1/2", 24lb., Box of 500. #1 White Coin Envelopes, Tip Envelopes, White open end coin envelopes 2-1/4 x 3-1/2", size 1, 24 lb. The popular envelope for payrolls, parts, tips and instruction enclosures. Made of strong 24 lb 92 brite white sulphite material with heavily gummed flaps. Packed 500 per box.