The Twister Arm Trainer for Men and women is a versatile arm and chest workout equipment designed for arm training. This adjustable arm trainer, model name ZY-U Shape arm trainer, is made from alloy steel and plastic materials in green and black color. This manually operated arm trainer is perfect for gym and training activities. The compact dimensions of 10.31 x 9.13 x 3.23 inches make it easy to use at home or in the office. This U-shaped arm trainer is suitable for both men and women looking for a convenient and effective way to expand their chest muscles.