This week, Tony builds Raphael's Sais from Teenage Mutant Ninja Turtles. The sai is a defensive truncheon originating in Okinawa. It is often mistaken for a dagger, as its use in the TMNT media would reflect. In traditional sai combat, they are carried in pairs, called saitachi. One is used for blocks and trapping weapons, while the other is used for striking, mostly with the knuckle.