Barter is the present and the future of international trade, especially for people who is starting in the import export business. Barter and more: Triangular operations.
The composition of the zipper
The zipper is composed of chain teeth, sliders, upper and lower stops (front and rear) or locking pieces. The fastener element is the key part, which directly determines the side pull strength of the zipper. Generally, the zipper has two pieces of chain belt, each chain belt has a row of fastener elements, and the two rows of fastener elements are arranged in a staggered manner. The fasteners on both sides are clamped by the slider, and the fasteners on both sides can be engaged or disengaged by sliding with the help of the pull tab.
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