Don't use plain paper (we tried it).

It was rejected by merchants, the post office, and some banks. It lacks perforations, colored background, and micro-wording. We supply ChecksForms to eliminate these problems and guarantee exact alignment of the MICR codes. ChecksForms are available in a variety of colors and you can add your own backgrounds. Each sheet makes 8 1/2" wide x 3 1/2" high (business-size) checks or 2-7/8"x6" wallet-size checks.

To make Deposit Slips, be sure to order the special forms for them.