Made of recycled kraft paper. Perfect small envelope size for coins, jewelry, date medications, resistors capacitors, seeds, credit card, SD memory card or any other small items. The envelopes have a gummed flap. Put the coins, seeds, small electronic components or any other items that need to sort or store into the envelope, wet the seal slightly with water, fold and keep the flap glued 2-3 minutes to seal. Great envelope for Seed Storage! If you want to keep seeds dry and protected, try these kraft paper coin envelopes! Great for garden seeds long-term storage. These small envelopes have long been popular for storing coins up to silver Eagle size.