Predictable, Reliable, Versatile. West offers Daikyo Crystal Zenith® cartridges used in drug delivery applications. West offers Daikyo Crystal Zenith® cartridges used in drug delivery applications. These cartridges are manufactured with the highest dimensional tolerances ensuring this cartridge technology is predictable and safe. Daikyo Crystal Zenith offers superior performance by using a polymer with proven functionality, safety and compatibility for a variety of devices making it suitable for high-viscosity drugs and long-term storage.