1. DURABLE ELASTICITY OF BREAST EXPANDER WITH SPRING The 5 springs chest expander is made of high quality materials for long lasting elastic. These springs provide strength and longlasting resistance and deeply stimulate your muscles when you squeeze them while using the device. 2. Comfortable fitness chest expander: ergonomic handle provides a comfortable grip, strong and durable. The removable chest expander for men is made of y and strong material, full of elasticity and toughness. 3. FLEXIBLE EXERCISE OF THE BREAST WORKOUT EXPANDER. With the pectoral muscle expander pull trainer, you can add or remove pipes to achieve challenging resistance. 4. NONSLIP HANDLE SPRING STEEL BREAST EXPANDER: with 2 nonslip handles, prevent your hand from falling off the chest trainer. This spring expander with wooden handle is easy to assemble and disassemble.