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Features: 100% New Brand High Quality Original Guarantee Made by latest safety dual spring-quality carbon steels Second Spring keep much safer when exercising There was a "second" noise when it be released. Perfect for building upper body strength High grade steel with molded plastic grips Until Now Max Springs Power 80KG/176LB to Challenge your Extreme Specifications: Materials:Quality Carbon Steel Springs and Non-Slip Plastic Handle Weight:30kg,40kg,50kg,60kg,80kg for you choose. if you don't know what's size you need, please refer the 30KG as the beginning