Selling like hot potatoes
Dennis and Kai had to sell Nuubu by batch to maintain quality since the manufacturing process had to be very precise. The herbs have to be picked carefully and dried out in Japan. Then the process of turning the herbs into a patch must also be accurate. But people were willing to wait for the next batch and even made their orders in advance.
Source: Tech4You
And it is no wonder why it is in high demand. The Nuubu patches use the power of reflexology to tap in the acupuncture points on the feet. It is a convenient and hassle-free way to clear out toxins from your body and improve blood circulation through the foot.