Quality autoclavable 8oz plastic reusable brown rice flour mushroom cake substrate jars with 3 rubber injection ports and a 2-micron syringe air filter designed specifically for those special mushrooms Grow mushrooms SUPERFAST with our special blend made specifically for your special spores! This is the ONLY jar substrate designed specifically for Psilocybe cubensis mushroom spores on the internet. Don't risk your investment, do it right the first time. Jars come with 3 rubber injection ports, a 2-micron syringe air filter, gloves, and alcohol pads. These jars are 100% reusable...save $$ in the future.