is a smoky quartz (smoky quartz) with high precision-cut natural stone insulator, emits a crystal glow of amber smoke color. Its physical properties Mohs hardness 7, specific gravity 2.6, having a crystal structure of a trigonal made of aluminum of SiO2 and trace, it combines the properties of high strength and high hardness. Its tone is very delicate and realistic. As if space is filled with the fine particles of the granular sound, glossy acoustic sound wraps the listener.

Its tone is clear straight. While full of strong core force sensation, you do not have to feel the peak and dip. There is a display like a gem worthy of the high-fidelity playback.

is using the natural stone that has been carefully selected, in the domestic jewelry workshop, carved in one by one carefully by the hands of jewelry processing craftsman. Its surface emits a beautiful glossy finish in the mirror polishing, and combines the high flatness.

Size INS-CF / INS-SP / INS-US common coin size (φ20, H6), a possible snap to "INS-BS". In combination with other "INS series", you can enjoy tuning of further tone.