Check the listing for details. Keri Systems KC-10X 5 Pack Standard Light Proximity Card. Condition: New – Open box. Listed at 38.00 USD. KC-10X Standard Light Proximity Key CardThe most popular proximity card in existence, it is thin enough to be “wallet-friendly” yet durable enough to carry a manufacturer lifetime warranty. It comes standard with a vertical slot punch and can accept photos and graphics via industry-standard adhesive packs (dye sublimation or laminated). Size is 2.13″ x 3.38″ x 0.065″ (54 mm x 86 mm x 1.6 mm). Sequentially numbered (C5 formatting excepted).Keri’s KC-10X Standard Light Proximity Key Card provides maximum read range performance in a thin package that is easily carried in a wallet or purse or worn on clothing with a clip or lanyard. These cards are extremely durable and convenient. They are manufactured with a vertical hanging slot punch and they come with a manufacturer lifetime warranty.