This is a Tyvek filter for mycelium bottles. It is a set of 100 sheets, 115mm x 115mm. As shown in the image, it can be used by sandwiching it in 800cc poly bottles or glass bottles. It has good breathability, does not tear even when wet, prevents the entry of harmful bacteria and insects, has good moisture retention, and can be washed and reused. This product is used by many mushroom bed manufacturers. You can buy it immediately. We cannot accept price negotiations for this product. Please note that we will not respond to comments regarding price reductions. If you would like a quantity other than the quantity listed, please let us know. It is an anonymous delivery service that allows buyers to trade without revealing their name or address, ensuring safety and security. We cannot accept requests for date and time of arrival. Basically, if payment is confirmed in the morning on weekdays, we will ship the same day. If you have any problems upon arrival, please contact us via message. We also sell a set of 50 sheets. Japanese Giant Stag Beetle Japanese Giant Stag Japanese rhinoceros beetle Rhinoceros beetle Stag beetle Stag Insect jelly Pro jelly Mycelium bottle Mycelium bottle #Insect jelly #High protein jelly #Made in Japan jelly #kb farm #Insect supplies #Insect supplies #Breeding supplies #Insect breeding #Food #Feed #Ant #Insect goods #Stag beetle #Stag beetle #Rhinoceros beetle #Rhinoceros beetle #Hercules #Japanese Giant Stag Beetle #Small animals #Pet food #Hamster #Hedgehog