Ensure your transactions are secure with the Dri Mark Counterfeit Bill Detector Marker Pens. This convenient dozen pack features black markers designed to quickly identify counterfeit bills. Simply mark a small line on the bill; if it leaves a yellow streak, the bill is likely fake. Compact and easy to use, these markers are perfect for businesses, cashiers, or anyone handling cash. With their reliable performance and portable design, you can have peace of mind knowing you're protected against counterfeit currency. Keep your finances safe with Dri Mark!