【Includes Shipping】Non-woven fabric filter for mycelial bottles, Tyvek Seal Non-woven fabric filter for mycelial bottles This is a set of 40 filters with a diameter of 40mm. You can attach them to poly bottles or glass bottles. They are breathable, do not tear when wet, prevent the entry of harmful bacteria and insects, have 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 negotiate the price of this product. Please note that we will not respond to comments regarding price reductions. If you want a quantity other than the one listed, please contact us. This is a safe and secure anonymous delivery service where the buyer does not have to disclose their name or address. We will ship via Yu-Yu Mercari delivery, so we cannot specify the 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. Japanese Giant Stag Beetle Japanese Giant Stag Japanese rhinoceros beetle Rhinoceros beetle Stag beetle Stag Tyvek filter Tyvek seal Tyvek Insect jelly Pro jelly Mycelial bottle Mycelial bottle Mushroom bed KB Farm Clear bottle Glass bottle Poly bottle