These are just fun and engaging tactile sensory balls. Great sensory feel and input for kids on the spectrum. They come in a set of four or six and are made from softer rubber so they are wonderful for squeezing.
Sensory diet toys are toys that provide sensations like texture, lights, movement, and/or pressure that many people with autism, FASD, and sensory processing disorder often need. These have pretty bright colors and they change colors with just a little warmth.