Efficiently sanitize card reader slots and point of sale systems with ReadRight CardKleen Wipes. Use to clean and disinfect the magnetic heads of POS card reader slots. This pack contains 25 pre-moistened cards that are individually wrapped to preserve moisture and keep them saturated. To use, simply open the package, insert and swipe the CardKleen wipe card twice, flip the card over and repeat. Before use, refer to the Owner's Manual of the POS system for cleaning and maintenance instructions. Convenient 3 3/8" x 2 1/8" Cleaning Cards. Application: Access Control/ID Cards; Credit Card Readers; Applicable Material: Plastic; Chemical Compound: Isopropyl Alcohol; Dirt Types: Dust.