This is a Tyvest 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. This is a safe and secure anonymous delivery service that allows buyers to trade without revealing their name or address. 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. Please note that we cannot ship on Sundays and holidays. 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