Thousands of hammers, also known as iron wire tree, rake tooth hook, Taiwan black ball, etc., are the roots of Cinnamomum camphora in Dinghu, Lauraceae. The functions of expelling wind and removing dampness, removing blood stasis and relieving pain are often used in medicine to treat rheumatic bone pain, traumatic injury, swelling and pain, and in addition, it has a good therapeutic effect on traumatic injury.