Toshiba supplies are specifically designed to work in Toshiba products. All of Toshiba products undergo vigorous testing prior to being distributed to customers. Toshiba makes sure that you are receiving the highest quality product that will work best with your Toshiba equipment. Many after-market and competitive supply manufacturers bottles or cartridges state, "for use in Toshiba" or "compatible with" but, their products may not be manufactured to Toshiba's demanding specifications and high quality standards. Specifications that are often overlooked such as particle sizes and electrical properties are critical for proper equipment operation. This cartridge is designed for Toshiba BD 5540 / 6550 Copiers.