NO GUARANTEE ON IF THEY LIGHT UP, ALL LIGHT UP TOYS ARE SPOTTY. MOST DO LIGHT UP BUT YOU MIGHT GET A COUPLE THAT DON’T. PLEASE DO NOT ORDER IF YOU WANT LIGHT UP ONLY. This dolphin is a soothing sensory ball. It is filled with a bunch of thick water bead gel orb balls inside its flexible skin. When you squeeze the dolphin the beads push out and around making the ball bulge. It is very soothing to feel the little gel beads, and it also makes a soft swishing sound to add to the sensory experience. Lights up and flashes when tapped.Jumbo-sized – 7.5″ x 2″Soft, squishy texture