Handmade Feng Shui Obsidian Wu Lou/ Hu Lu Gourd Necklace Amulet with Tibetan Mantra (With a Betterdecor Pouch) The sale is for one Obsidian Wu Lou /Hu Lu Gourd Pendant Necklace amulet for protection and a "Betterdecor"printed on a black gift pouch! Obsidian can obsorb the negative energe from people's body, so it is good for health Adjustable String . Size of Wu Lou: 0.75 in length. Material: Obsidian Wu Lou also known as Hulu , Calabash Gourd. The Tibetan Mantra on the Wu Lou is "Om Mani Padme Hum" you may use it as a amulet necklace , it also can be a great gift .