BIG Bamboo Brim, Black, Made in Japan. Rare black color The sole is also called the second heart of the foot, so it focuses on the important buds, for the human body. BIG bamboo fumes provide just the right amount of stimulation to each trigger point area. The new ergonomic shape gives you a comfortable massage feeling throughout the sole of your foot. How to Use: Step 1 to 2 times each day for about 3 minutes. If you feel that the stimulation is too strong, please use a towel and use it. Use it after a bath for added effect. Please use it in the office, kitchen, bathroom, etc. Size (W x H): Approx. 16.9 x 3.9 inches (430 x 100 mm); Projections are available in various heights and sizes to stimulate the foot buds slightly. We will include an A4 size foot tip sheet, so please use it as a reference.