The Shinai reference article from the English Wikipedia on 24-Apr-2004
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Shinai

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A shinai is a practice sword used in Kendo.

Construction of the Shinai

Practice sword made of four bamboo slats (take) held together by two leather caps, tsuka-gawa (handle) and saki-gawa (tip), and a string (tsuru). Placed under the saki-gawa is a rubber plug saki-gomu. To prevent the four take from getting misplaced there is a small piece of metal, chigiri, placed between them inside the tsuka-gawa.

Regulations

In competition there are regulated weights and lengths of the Shinai.