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Q: Is it slippery material or non slippery. I have similar item that slips out of wallet too easy & cards slip out of it too.

This is like a cardboard little envelope that fits the card smugly. If it's in your wallet it shouldn't slip out - I haven't had to worry about mine.

Q: what if your not traveling and you didn’t go anywhere and you find out they used your to other state?

Hello, Our RFID Blocking Sleeves protects you from Radio Frequencies that thief's uses whenever they are around you. If in any case your card is used in another state and you have not traveled the last few days, you must check where you used your cards online, it might be that you have entered your details in a phishing site and did not notice it. I would also recommend you to contact your bank immediately.

Q: I keep a credit card & drivers license in a sleeve stuck to the back of my iphone case. Could this work in the same way? Or interfere with phone use?

Hello, the RFID Sleeves are meant to hold one card per sleeve. We do not recommend putting in two cards in one sleeve as it may damaged the cards and as well as tear the sleeves apart.

Q: What kind of material is it that makes it block It being read by some digital bandit?

The inside of the material is made of a ferrous/metallic coating. Similar to Aluminum foil. Digital bandits use devices that transmits a signal using Radio Frequencies (RF). Since RF travels through the air, the metallic sleeves provide a protective barrier (similar to a Faraday Cage), that prevents the Bandit's RF Signals from penetrating, thus reading your Credit Card. Think of riding in an elevator and trying to talk on your cell phone. Most of the time, the metal doors and metal walls blocks the RF signals from your cell phone from getting in or out. The sleeves function in a similar way. Hope that helps. :-)