You are buying 10 of these medium sized Dragon glass (Obsidian) tumblestones 3/4 inch - Dragon glass was the crystal used to Kill the Whitewalkers in Game of Thrones
They come in a pretty organza gift pouch with information on the crystal
Obsidian is a shiny black volcanic glass - It is an Ancient Talisman used as protection to ward off negative energies but also to reflect back to us our own negative feelings of resentment, fear etc so we can do something about them
Obsidian has also been used as scrying glass by the Wiccan tradition - used as a seers glass it is said to give access to visions of the future - so maybe Bran had a few in his pocket too.
CHECK OUT OUR OTHER GAME OF THRONES ITEMS = DRAGONS CRYSTALS ARROWHEADS PENDULUMS