One open for inspection. The TN830xl 4 Pieces.4 Black toner cartridge is a compatible product designed for use with Brother printers and possibly other compatible models. The set includes four black cartridges, as indicated by the model number. These cartridges are essential components for printing high-quality documents and images in black and white. With a focus on compatibility and quality, this product is a reliable choice for those looking to replenish their printer's toner supply. The included pictures provide a visual representation of the product, allowing users to easily discern its specifications and functionality.