Chinese Finger Traps
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There is nothing special about the bamboo or other material. The tightening is simply a normal behaviour of a cylindrical braid, usually the common biaxial braid. Pulling the braid lengthens and narrows it. The length is gained by reducing the angle between the warp and weft threads at their crossing points, but this reduces the distance between them and hence the circumference. The more one pulls the more the circumference shrinks (i.e. the trap tightens). The same effect is used in specialized textile manufacturing, and by fly-fishers [1].
Chinese finger traps are not intended for use as restraint devices. Strong victims of the prank may break it when they pull outwards, attempting to free their fingers and stretching the trap beyond its limits.
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Visit the Game Treasury - Chinese Finger Traps page, or read the Chinese Finger Traps Review.