?Our warranty to you? Our product comes with a lifetime warranty. We provide excellent service and will replace defective parts if you experience a problem. ?Easy to Use?You can adjust the strap on the weighted ball to suit your needs. The hoop should fit snuggly around your waist and just swing the ball and move hips and start your exercise session. ?Innovative Design? This weighted exercise hoop comes with a counter and 360° shock-absorbing spinning ball to help you measure your work-outs. It allows you to follow your progress with every work-out and measure your success. ?Premium Materials? The smart weighted exercise hoop is made of hard ABS plastic to prevent equipment aging. The inner massage heads are made of highly elastic soft silicone to protect your skin and provide soothing massage of your abdomen. The upgraded soft silicone massage heads provide 360° abdominal massaging action to tone and tighten your abdomen. ?The fewer knots used the better the performance?This hoop is designed for small and medium size waist. It comes with 12 knots. You can try to use within 12 knots, but for optimal performance use within 11 knots, waist sizes from 25” to 36”, The remaining knot is spare.