Kamui Chalk Shark Magnetic Chalk Holder is constructed with two very powerful rare earth neodymium magnets are used to produce an ultra strong attachment. One magnet is embedded within the leather construction of the pocket clip and another magnet is installed in the bottom section of the molded chalk holder. Comes in it's very own shark tank! Inside is a mini booklet sharing the story about the designer and the design of the Chalk Shark. Available in brown or black.