This set of luminous balls from Cleverclixx adds glowing action to any ball run, marble track, or race circuit. This motion-activated design lights up only while rolling—growing brighter with speed and switching off when stationary—for exciting night races and visual sensory play. This set is made from durable ABS plastic and is BPA-free, and includes four vibrant, track-compatible coloured balls. This light-up accessory works as glowing marbles or race balls for party fun, coordination practice, and dim-light play that keeps children engaged.