A currency strap, currency band or bill strap is a simple paper device designed to hold a specific denomination and number of banknotes. It can also refer to the bundle itself. In the United States, the American Bankers Association (ABA) has a standard for both value and color. Note that all bills greater than $2 only come in straps of 100 count. The colors allow for quick accounting, even when the bills are stacked, such as in a vault. Special striping bands are used for straps containing star notes.