Keep your deposits secure with the Nadex™ Coins 9 in. x 12 in. multipack of Tamper-Evident Bank Deposit Bags! These are self-sealing bags that cannot be opened and resealed without showing signs of tampering. The bags are also made from fully recyclable plastic. FRAUDSTOPPER® technology is categorized as LEVEL 4, which is the highest security level, as it incorporates both heat- and cold-indicating technology. Use of cooling agents will cause VOID graphics to appear on the closure. If heat sources are used, blue dots will appear on the closure to indicate tampering. Inked self-sealing closure will deform and change colors if tampered with. The patterned and serrated edge closure system is designed to promote fracturing in the event of a tampering attempt. Extruded plastic of these bags is very resistant to tearing and cannot be smoothed back to its original state. Each bag also has a unique deposit number with a scannable UPC for keeping track of your deposits. There is a peel-able receipt label on the inside of the closure, which you can peel off before sealing the bag. Receipt has the bag ID number as well as spaces for writing deposit details.