The CASCHA Guitar Pick Box Medium contains 24 red picks made of particularly abrasion-resistant celluloid. The picks have a thickness of medium (0.71 mm). Therefore you are well equipped for any playing technique or music style. 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.