Bests & Worsts Reviews from Amazon

In a time when skimming and cloning are at an all time high, we thought these would be a great idea. To be sure they worked, we tested all twelve sleeves with different cards and every card in every sleeve could be read without being removed from the sleeve. My husband (who works in EMC testing for the auto industry) took them to work and he and his engineers tested them with a different assortment of cards. They even double sleeved some so that the card was completely enveloped. They ALL still failed. They had low-tech success using just aluminum foil. I gave the seller 2 stars because the sleeves were attractive and well made and arrived in a timely fashion. They just don't work.