Safe and Durable: 5 thick eco-friendly soft latex tubes ensure long-lasting tension, and the cover design is added to prevent jamming. Soft rubber coated handle protects user's hand and prevents it from slipping during chest workoutADJUSTABLE FORCE: Five detachable rubber wires, force adjustable. Perfect upper body workout. Train your arms, chest, shoulders, back and entire upper body Customize your workout: Removable springs can be used to customize resistance levels, and by putting the power of weight control in your hands, you can easily develop overall upper body strength. Locking buttons ensure the spring only releases when you need it Lightweight and portable: The chest expander is lightweight, portable and space-saving exercise equipment. You can use and carry our arm resistance band for a complete workoutChange your body: Adjustable resistance bands are suitable for muscle building, body shaping and fat loss. Modify your body to improve your muscular endurance, strength and balance. Chest exercises can also help you breathe easier and improve your posture