[Upper Body Training Device]: This spring-powered twister bar is designed to work the arms, chest, shoulders, back, biceps, waist, neck muscles, and upper body. [Premium Quality Assurance]: The chest expander uses high-grade elastic fiber for high tensile strength and sturdy, eco-friendly durability. [User-Friendly Design]: Its ergonomic rope handles avert slipping, delivering resistance throughout the workout. [Easy to Transport]: With its lightweight and minimalist design, it's simple to carry anywhere—to the office, gym, or on trips—for exercises anytime. [Universal Application]: Suitable for young individuals, beginners, fitness enthusiasts, and trainers; select according to personal strength. Specification: Material: PE/nylon webbing/high elasticity fiber Package Includes: Note: Slight variances may occur from manual measurement and differing monitor displays.