Tomoe Shuriken

Tomoe Shuriken (巴手裏剣, Tomoe Shuriken) are a unique brand of designed by Sunagakure's Tomoe Clan. They are quite large shuriken with a large space in the center. Their overall design resembles the insignia of the clan itself. Each blade of a Tomoe Shuriken is foldable. A total of six rotating blades can stack adjacent to each other and be wielded from the shuriken's broad central gap as a melee weapon. The Tomoe Shuriken's signature feature comes from the blades' unique curvature. Because these blades were designed for Sunagakure's climate, they work best in windy weather. When the Tomoe Shuriken reaches certain speeds, or is deflected with sufficient force, the mechanism holding together the shuriken from the center unhinges, causing the blades to separate. These curved blades are easily influenced by strong winds, and are finely formed so they continue to fly in their original direction even when dispersed. 
These shuriken are often combined with , among others, in order to enhance their capabilities. These shuriken are also the basis for any Tomoe Clansman's original shinobi tool.