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Add them into your weighted vest, leg strap or arm strap to do weighted training. Rounded edge design, not sharp, with no any security risks. Training vest fitness promotion: thin steel can increase the weight of the sports training vest, thereby enhancing its strength. Weighted vests are easy to use: you can increase the amount of thin steel according to the vest leggings you need. Made of high-grade steel. Does not contain any substances that are harmful or allergic to the human body. Strong and durable, not easy to rust.