123inkjets offers the best alternative to the OEM (genuine) Ricoh 405537 (GC 21CH) high-yield cyan inkjet cartridge. Manufactured brand new, our compatible 405537 cartridges are built to perfection for crisp, clear prints, every time. Our compatible 405537 series ink cartridges come with smart chips that allow you to track ink levels on your computer. Purchase our 405537 cartridges and enjoy the benefits of tracking your ink levels on your computer. Ink you can rely on at a price you can afford. 100% Satisfaction guaranteed on all 123inkjets compatible cartridges.