It's easy to automatically mix and dispense Impregum Penta Impression Material with this durable, metal-reinforced cartridge and the Pentamix 3 Automatic Mixing Unit. Refill includes one cartridge (purple).It's easy to automatically mix and dispense Impregum Penta Impression Material with this durable, metal-reinforced cartridge and the Pentamix 3 Automatic Mixing Unit. Refill includes one cartridge (purple).• Durable, metal-reinforced cartridge • Automatic mixing and dispensing with the Pentamix 3 system • Absolutely homogeneous and void-free mixing at the touch of a button • Automatic mixing and dispensing with the Pentamix™ System for completely homogeneous mix at the push of a button