As the first and only in Europe we are proud to present a great succes from USA. Many know how it is with some mouthpieces. They get grey/green and not very nice. Obsidian is a new solution to this problem.Obsidian Pipe Stem Oil isnít a wax or a cleaner. Obsidian Pipe Stem Oil is specifically designed to help keep your vulcanite, ebonite or Cumberland stems from oxidizing and help keep them looking newer for longer. In addition to conditioning and sealing the pores of the vulcanite, thus resulting in much less oxidation, Obsidian also contains small amounts of organic quality UVA/UVB protection. Try it and see why it should become a permanent part of your pipe collection! Itís also great for new pipes. Directions: After smoking, wipe off the stem. Apply a few drops of Obsidian oil to the stem and rub in. After 30 minutes, wipe the stem with a soft cloth and store as usual.Each 15ml bottle should last for months with regular use!