Used 830ml mycelium bottles. These are not glass bottles. They are clear bottles that have become unnecessary after purchasing pre-made mycelium bottles this season and replacing them. They have been washed, but there may be some mycelium residue remaining. Also, please note that these have only been used once and may have sticker residue, scratches, and other marks. Approximate size is 100mm in diameter and 135mm in height. I'm sorry, but I cannot offer a discount, so please understand.