Maintain your equipment with Gorilla Supply’s pre-saturated cleaning cards for a safe and easy way to protect and clean your card readers! Regular use is a cost-effective way to prolong the service life of magnetic heads and prevent transaction errors caused by dirt build-up. Double-sided cards effectively brush away dirt, dust, oils, and other forms of contaminants that build up on your magnetic and optical readers. Cleaning cards are individually sealed for single use and long-term storage. Use Klex Microfiber cleaning cards for especially tough grime on readers and heads.