Business Source 04444, 3-1/8 x 5-1/2" coin envelopes are ideal for small parts, samples, seeds, enclosures, loose coins and payroll applications. Flaps feature deep gumming for a secure seal. No. 5-1/2 coin envelopes are made of sturdy, 28 lb. Kraft stock. Packed 500 per box, 10 boxes per case.