Toshiba makes sure that you are receiving the highest-quality supplies 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, and all of Toshiba products undergo rigorous testing prior to being distributed to customers.