Vongola W.S. (Wrist System) are six bracelets designed by Arashi Fukada with Shinji Kimitaka's help, made finally by Masato Fukada and Arina Luccini. They perform a function of strengthening and relaxation of the flames, similar to the power of the Vongola Rings. The flames emerge from the colored stone on the top of the bracelet.
Vongola W.S. have been programmed to react to Nozomi Sawada's Vongola Locket and they can communicate with each other.