Material: spring steel， plastic

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Benefits chest workout that: biceps muscle is a muscle two heads， its main role is bent. When bent， also used in another muscle - brachialis. While only doing some forearm elevation of movement， such as curl or chest high trans-high toy chest， brachial muscle to get adequate exercise. In addition， the upper forearm flex major muscle brachial muscle in bent arm action also played a lot of action. Scoliosis move through chest muscles can be strengthened brachial scratch.

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