Need to add weight to the ball by yourself.Note: (without sand)Product Description:Smart Hula Hoop is easy to use: Compared to conventional hula hoops, this intelligent hula hoop does not fall off.The diameter of the tire can be perfectly adjusted to your waist by arranging the individual links. Adjustable cord length.Minimum inner diameter approx. 16 cm.Maximum inner diameter approx. 34 cm.Minimum waist circumference approx. 49 cm.Maximum circumference of the waist approx. 120 cm (with 24 tire links).Additional function: the massage nubs. Color: pink/PurpleBall weight approx. 120g can be filled with sand to increase weight Note: (without sand)Package includes:1 * hula hoopFeatures1. It is suitable for men, women and children.Suitable for the waist and turn the waist for a long time, does not fall.2. Can be used in a variety of applications, for post-natal recovery, office sedentary, and hoops are also suitable for sports advocates.3. The hoop exercise can quickly consume body fat and eliminate fatigue.SuggestionThe hoop can be composed of sections, which can increase or decrease the number of slides on the main body to adjust the waist size.24 sections suit for your whole family and friends.Note1,Product sizes are measured by hand, please carefully compare the size when purchasing.2,Please allow 1-3cm differs due to manual measurement.3,Due to the different display and different light, the picture may not show the actual color of the item.Thanks for your understanding.4,The sport hoop ball does not contain fillers, please fill it by yourself. the user can change the number of weight-bearing blocks in the weight ball according to their own bearing,For beginners, it is recommended not to exceed 200g.