This product is a unique double sleeve ring for suitable for eating fungi It consists of a bell mouth and a cotton free hide It is simple to apply The conceal can be used in high temperature and excessive pressure, and may stand up to 126 ℃ -130 ℃ The bag mouth sealer is a group composed of a hoop and a canopy The disguise is provided with a sponge to facilitate the expansion and air flow of mycelium It can be used to seal the mouth of plastic cultivation baggage or bacteria luggage When making bacteria, there's no cotton plug, which is handy to apply and saves hard work Size:as photographs demonstrate Package includes:20pcs/set