The product is a genuine RISO GR S-539U black ink tube cartridge 2-pack. It is designed specifically for use with RISO printers, ensuring high-quality printing results. The black ink is ideal for producing professional-looking documents and images with crisp, sharp lines. The cartridges have a final grade of A, guaranteeing optimal performance and reliability. Perfect for those needing to print in black and white, this 2-pack of ink cartridges offers convenience and consistency in one product.