The Tube Material Is Tpe, Which Is Tough and Elastic. Ergonomic Anti-Slip Handles Provide A Comfortable Grip. 5 Rubber Resistance Bands To Adjust The Strength. Strengthen Your Chest, Arms and Shoulders. Overhead Pull Helps Expand Upper Back. . The Handles Are Made of Hardened Plastic With Rubber Grip Inserts Made of Comfortable Natural Rubber. This Ensures A Secure Hold During Strength Training. The Strings Can Be Attached and Detached Depending On The Workout. There Is An Additional 5 Kg of Tensile Force Per Resistance, Which Means That The Training Can Be Individually Designed. . The Curved Handle Design Fits The Palm and Feels Comfortable In The Hand. The Antler Buckle Design Can Firmly Connect The Handle and The Rubber Tube, and Is Not Easy To Fall Off. The Adjustable Chest Expander Can Adjust The Tension Freely. 5 Tube Expanders Draw About 75 Pounds. . The Chest Muscle Trainer Is Lightweight, Compact and Lightweight, and Can Be Folded, Easy To Carry and Store, and Exercise At Home or In The Office To Maintain Health. Different Way of Exercising With The Chest Expander Allows You To Strengthen and Shape Any Muscle Group.