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LUX #1 Coin Envelopes (2 1/4 x 3 1/2) are great for storing small parts, such like: coins, jewelry, stamps, seeds, SD memory cards, resistors capacitors and all other kind of small electronic parts, sold as 500 per box. #1 Coin Envelopes (2 1/4 x 3 1/2) in Copper Metallic are a copper penny color with a shimmer. These envelopes are perfect for holding small items and collectables. This multifunctional envelope is constructed from 80lb. paper and designed like a standard-sized envelope, but a miniature version. With a secure, moistenable flap, this is the ideal envelope if you're looking to store your coin collection, stamp collection, organize manufacturing parts, seeds or any small inventory items. Please note that this envelope size is not mailable via USPS.