Please only purchase if you understand that this is a used item stored at home. ┈┈┈┈┈┈┈┈┈┈ The secret lies in the single tooth on the sole. "Sole Balance Colon" - Core training just by standing. Turn the core training using geta, practiced by professional athletes, into "while-you-do-it" training at home! Simply stand on the single tooth on the sole. It targets deep muscles and improves core strength! ┈┈┈┈┈┈┈┈┈┈ No box.