Special TMS Comfort Option. While design and working comfort are priorities in the creation of all our scissors, were offering a model thats more specifically adapted to the prevention of musculo-skeletal disorders (MSD), the Model SWO. The 360° rotating ring on the Model SWO reduces tension on the wrist, tendons and shoulders as you cut. This comfort option prevents and soothes problems like carpal tunnel syndrome, a common problem for stylists. The feel is natural because the thumb can move. It can follow the cutting movement with perfect precision without requiring movement of the shoulders and contractions of the stylists hand. Undeniable working comfort to preserve your health and career. Offered on the Karakuri line, this option also allows you to keep your handles and just repurchase the blades. So, these scissors are a profitable but also durable investment.