These 4" puffer balls glow in the dark and have soft rubber spikes and a super-squeezable texture. When you squeeze these puffer balls, an air bubble emerges from the interior. For ages 5+. Fidgets are a self-regulation tool used with children who have a difficult time sitting still or focusing. Fidgets help promote focus and concentration, and keep the body (fingers) busy so they can still sit and focus! Fidget toys are also great for strengthening hand muscles and building fine motor and finger dexterity.