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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 1000 per box. #1 Coin Envelopes (2 1/4 x 3 1/2) in Crystal Metallic are perfect for holding small items and collectables. This multifunctional envelope is 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 or any small inventory items. Constructed from 80lb. paper, Crystal Metallic is a shimmering white metallic envelope. A modern way to convey quality and add personality, with sparkle and shimmer that stands out. Please note that this envelope size is not mailable via USPS.