Fully Adjustable Athletic Elastic Rubber Band Make It a Perfect Fit for Men Ladies & Childrens Alike. It Provides a Sung Fit for Ankles & Wrists of All Sizes. They Are Made of High Quality Fitness Materials-recycled Iron Cube Block Wrapped in Soft & Skin Friendly Silicon. Very Comfortable on Your Wrists & Ankles. the Simple Design Make It Easy to Wear & Clean. It is Also Available in a Range of Colors. It Will Not Interrupt Your Motion During Workout Comparing with Traditional Weights. They Are Perfect for Strength Training When You Want to Increase Exercise Intensity, Burn Fat, or Increase Muscle Mass. They Are Providing Constant & Comfortable Resistance to Daily Workouts Such as Walking, Jogging, Core Training, Fitness, Gym & Other Exercises. Minimum Quantity: 50