1. The dual-arm trainer is designed with a lightweight structure (only about 0.45kg), making it easy to handle with one hand while delivering powerful muscle-stimulating results through its high-resistance rotation mechanism. 2. Utilizing the centrifugal force principle of Arm traine this arm exerciser smoothly rotates 360 degrees with high sensitivity, allowing effective forearm, wrist, and upper arm muscle training with just a gentle shake. 3. Equipped with an internal rotating ring track and a suspended 0.15kg weighted ball, this compact training device continuously engages arm muscles, helping to tone biceps, triceps, and forearm muscles for a sculpted "Swan Arm" look. 4. Ideal for individuals with sedentary lifestyles or limited physical activity, this muscle trainer helps relieve shoulder and neck discomfort, improve posture, and reduce underarm fat while strengthening chest and arm muscles. 5. Easy to use for just a few minutes a day, this arm toning device delivers effective results when combined with stretching and dietary managementrecommended usage is 3–10 minutes daily depending on fitness goals. Material: ABS Color:As shown in the figure Product size: 19 x 16 x 7.5 cm / 7.48 x 6.3 x 2.95" Package list: Arm trainer x1