Experience limitless learning and fun with these colorful stones! Stack, balance, hop, and toss them, or even organize them into something entirely new. Each set comes with 6 pastel-hued rainbow stones plus one super-stable confetti board - strong enough to hold up to 396 lbs and 264 lbs, respectively. Built with eco-friendly EPP (expanded polypropylene) using a cutting-edge water-vapor process, these light-as-air stones provide endless opportunities for thrilling play, indoors or out - just keep sharp objects away!