Rhino Skin balls deliver a long-lasting, no-sting product perfect for gym class, the playground or home - indoors or outdoors. Bright colors, a lightweight foam core, soft exterior and tear-resistant coating make these balls a top choice for dodgeball, foursquare and other popular playground games. This set features two ThermoGrip, two Spider and two Luminous balls as well as a mesh bag. These balls are sting-resistant, low-density and low-bounce. ThermoGrip balls are thermo-enhanced for heat-activated change. High-tech Spider balls are safe enough for children and rugged enough for adults. Luminous balls feature a luminous glow when set under any kind of light for 30 seconds.