Adjustable 22-66lbs Resistance: Easily change the resistance from 22 to 66 lbs (10-30kg) by turning the yellow knob. Perfect for all fitness levels. Ergonomic Comfort Grip: Features a curved groove handle designed to fit naturally in your hands, ensuring a secure and comfortable hold during exercise. 【Dynamic Swing Resistance Tech】: Our Shake Weight uses physics-driven resistance to make muscles work harder than static adjustable dumbbells. Ideal for functional arm, chest & core home fitness 【22-66 lbs Rapid-Adjust Dial】: Turn the yellow knob to easily switch resistance (22/33/44/55/66 lbs). This versatile core fitness adjustable dumbbell set fits all fitness levels instantly 【Ergonomic Comfort Grip Handle】: Curved groove handle ensures a natural, secure, and comfortable grip during dynamic workouts. Perfect for shake weight for women and men 【Space-Saving 2-in-1 Design】: Replaces 6 pairs of dumbbells. Compact size stores anywhere, making it the ultimate space-efficient adjustable dumbbell set for home gyms 【Efficient Full-Body Workout】: Combines vibration & swing motion for maximum calorie burn. Achieve a complete core adjustable dumbbells workout in just 15 minutes