Fangrui Product Details Size: The Size Of The Cr80 Cleaning Card Is 3.375 Inches X 2.125 Inches, And The Thickness Is 0.03 Inches. This Is The Standard Thickness For Credit Cards, So Dont Worry About It Not Fitting Into Your Card Printer/reader. It Works With Most Card Readers And Card Printers. Fast Effective Cleaning Card: The Liquid On The Card Reader Cleaner Quickly Cleans Your Machine Of Residue And Dirt. You Dont Need To Wait Too Long After Cleaning, It Will Dry Quickly, And The Card Reader Can Be Used Normally Immediately After Drying. Reduce Card Reader Failures: Individually Sealed Packages Do Not Allow Cr80 Cleanig Cards To Dry Out And Are More Suitable For Regular Cleaning. Weekly Cleaning Prolongs The Life Of The Heads And Prevents The Build-up Of Dirt That Can Cause Data Read Errors. How To Use: Step 1. Take Out The Credit Card Reader Cleaner. Step 2. Place The Cleaning Card Into The Card Reader Like A Credit Card. Step 3. Turn The Card Over And Repeat Step 2 Until Clean. Durable Residue-free: The Card Re Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.