These are made for the Martial artist in mind. These are Tsuba (hand guards) for shinai and bokken, which is most often used in kendo. They are made from horn, then stingray is applied, lacquered, smoothed, and finished. These are strong, very durable, and will last a lifetime.
Please be aware that you may need to alter the size of the hole in the center for a perfect fit, as all bokken/bokuto and shinai are of different sizes.