They allow you to record all your transactions. It is like an envelope and it fits over your credit card snugly.
Some people call it a credit card condom.
This tool is great for tracking your credit card usage. For a limited time, we are making this available to anyone. If you recently attended a United College Marketing Services sponsored seminar AND signed up for the credit card offered at the seminar you're eligible. You'll get your cool new t-shirt in 2 weeks. There are other ways to get Free stuff.