Introducing your new favorite coin envelope: JAM Paper & Envelope #3 coin envelopes. Not only are they useful for storing coins (see what we did there?) these 2 1/2 x 4 1/4 coin envelopes will have you looking for things to collect. From jewelry to business cards our durable and classic brown Kraft (also known as manila) coin envelopes are the perfect place to keep valuables safe. These straight flap envelopes have a smooth finish are made from 24 lb. paper have an open end opening and a gum closure. Size: 2.5in x 4.25in