1、 Board of directors, institutions and methods of joining the board of directors

摘要

The invention refers to the Federation, the Federation's devices and the method of using them. Specifically, it provides a loop consisting of a closed elastic material loop with an internal and external edge. The thickness of the first position of the committee is 0-30% of the width of the committee, far away from the outer edge, The thickness of the second location, measured from the first position, is at least 50 per cent of the board's width, and the thickness measured in the third position from the first position to the middle of the second position is at least 10 per cent of the board's width,It's the thickness of the first one, which is thicker than the third one The thickness of any one A. is reduced from the first to the third and then to the second, which is linearly reduced to a lower thickness towards the inner edge through one or more fuming portions,Or B. the aggregation is reduced from the first thickness to the third thickness through one or more layers to down down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down, down Internal or