Blue Marble Business Pocket Checks are a portable solution for business on the go. These checks are small enough to fit in a briefcase or purse and the check register is included to help keep your finances organized. These Pocket Checks are available as singles or duplicates. Each order of 150 singles contains 3 books of 50 checks and 4 deposit tickets. Each order of 150 duplicates contains 6 books of 25 checks and 2 deposit tickets in the back of each book. The checks detached are 8 1/4" x 3" (standard business check size). This check product is protected by several security features:Padlock Icon: This icon insures you that security enhancements are being used in accordance with Financial Stationers Association guidelines. MP Signature Line: The MP icon indicates that micro-security print is used in the design. This is very small print that will break up if photocopied. Rear Panel: The reverse side of the check describes some of the security features incorporated in the check design.