The CASCHA Guitar Pick Box contains 24 colorful picks made of especially abrasion-resistant celluloid. The picks have a thickness of light (0.46 mm), medium (0.71 mm), heavy (0.96 mm) and extra heavy (1.20 mm). So you are well equipped for every playing technique or music style. The color selection of the picks is done randomly from a wide range of colors. To open the Pick Box you have to press the lid in the middle. To close it, simply put the lid back on the box and press it on the sides until you hear a "pop" sound. Make sure that there is still enough air in the middle of the metal box to open it again.