Measures 4.25" H x 2.25" W plus strap.
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Note: These are designed to have a tight fit. For inserting the ID card, it helps to squeeze lightly from the edges to relieve the tension and from there it does require some wiggling to get the card inserted. It also helps to use a business card to fully insert the ID card. To remove, squeeze from the edges and tap to get the card to fall out or try squeezers.