PP Bottles 800cc, 32 bottles, manufactured by Chikuma Kasei Japanese Giant Stag Beetle Larvae, Kinshi Bottles (for mushroom cultivation) All bottle caps are sponge filter type. Since they are not mixed with other caps, filter management will be easier later on. Also, to allow for immediate use, the sponge filters are new or have been cleaned. If you are concerned about dirt, please replace them before use. These are used items. Some caps have markings from a marker. There are bite marks from larvae, showing signs of use. Photos of a sample bottle with noticeable bite marks are uploaded. They were used for breeding stag beetles and rhinoceros beetles. They have been cleaned with tap water using a brush. Thank you for your consideration. *The green basket is not included. They will be shipped in a hard paper bag.