This cartridge is the key to the multiplication of a diverse microbial-rich solution from your Vermi T? 5/10 Extractor. This configuration is sold off the shelf without bottles for customers that own their own Vermi T? 5/10 Extractor. When purchased in case quantity, it comes in a full-color display case that easily fits on a counter or shelf. Cartridge has a 2-year shelf life.