Comes with necklace string! Tree Cookies (some people call them Tree Discs) are cut from tree trimmings. You can read the rings to discover the life history of the tree branch! A hole has been drilled in each tree cookie and we have included necklace-size twine so that each child can decorate and then wear their creation as a natural necklace! Great for name tags, wood burning, coloring, etc. Standard size tree discs are approximately 2"-3" in diameter; and 0.25" thick.