This is the Taibest Filter for mushroom bottle substrate. This is a set of 100 filters, each measuring 150mm x 150mm. As shown in the image, you can use them by sandwiching them in 1400cc plastic bottles or glass jars. Of course, they can also be used with 800cc bottles. They have good breathability, do not tear even when wet, prevent the invasion of harmful bacteria and insects, have good moisture retention, and can be washed and reused. This product is used by many mushroom substrate manufacturers. You can purchase immediately. We cannot accept price negotiations for this product. Please understand that we will not reply to comments regarding discounts. If you wish to purchase a different quantity than what is listed, please let us know. This is a secure and anonymous shipping method that allows the buyer to complete the transaction without revealing their name or address. We cannot accept date and time specifications for arrival. Basically, if payment is confirmed in the morning on weekdays, we ship on the same day. If there are any problems upon arrival, please contact us via message. We also have a 50-piece set available. Giant Stag Beetle Stag Beetle Rhinoceros Beetle Beetle Stag Beetle Stag Beetle Insect Jelly Pro Jelly Mushroom Bottle Substrate Mushroom Bottle Substrate