Tired of endlessly searching for your transmitter & receiver crystals lost somewhere in your toolbox? When you do find them, is one of the pins broken off If you answered yes to either of these questions, then you are definitely in need of our crystal case. It is the only case on the market that completely protects your crystals from damage by fully encasing them in a unique style container that "locks" the pins of the crystal into place. Each case holds four pairs of crystals. With the lid snapped shut, you can bang the case around in your tool box and never worry that your crystals will be damaged. Available in black or translucent, deep blue. Try keeping one band of crystals in a black case and another band in a blue one!