Bo Shuriken (Throwing Needles)Bo Shuriken, also knows as throwing needles, are the variation of the popular throwing stars used in Ninjutsu. They were used as a secondary weapon to the sword, and were not generally considered to be a killing weapon. These Bo Shuriken are made of forged and tempered blackened steel. Each shuriken is approximately 6. 25 inches long and weighs 60 grams each. Weighted and balanced for throwing. Each set comes with 6 shuriken and canvas forearm