Geospace Sparkler LED Jump Rope with Kinetic-Powered Lights (Assorted Colors) LED lights are kinetically-powered by the motion of the Jump Rope Never requires batteries! The lights add an extra element of fun and are especially bright in dark conditions A great way to get kids to stay active without a lot of convincing required Comes in just one size (Length of rope is 99-inches) so best for about Ages 8 years to adult