Throwing spikes or bo-shuriken are throwing weapons consisting of a straight, iron or steel spike, usually four-sided but sometimes round or octagonal in shape. They are usually single-pointed, but some have points on both sides. The length of the spikes ranges from 5 to 8 1⁄2 inches and the average weight was from 1.2 to 5.4 ounces.
The spikes are thrown in a number of ways, such as overhead, underarm, sideways and rearwards, but in each case, the throw involved the blade sliding out of the hand through the fingers in a smooth, controlled flight.
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