This is another one of swordsswords remarkable product, the Asuma Wooden Trench Knife or Wooden Knuckles. Asuma uses trench knives (brass knuckles with a blade on one end, similar to kerambit) to fight. With his Flying Swallow, he can extend the blades with his chakra to injure an enemy several feet out of the physical blade's range. When demonstrating his wind-based chakra for Uzumaki, Asuma explains that these chakra-covered blades (when utilized by someone with wind-based chakra) possess enough power to pierce through rock. During the invasion of Konoha, Asuma is able to use these blades in unison with his taijutsu abilities to single-handedly defeat nine Sound ninja without being hit once. This wooden trench knife comes in sets of two and it measures 10" long.