The Professor Marty's Clever Glow in the Dark Putty can stretch like rubber and bounce like a ball, and because it's silicone-based, it won't dry out or crumble over time.  Features & details Clever glow in the dark putty is fun and irresistable Mould, stretch, bounce and watch it shape Place under direct light before glowing in the dark Tub 6.5cm x 3.5cm x 2cm approx All of our putty is fully tested, non toxic and safe, suitable for ages 3+ but must be used under adult supervision at all times If putty gets on furniture, wooden floors, carpets, wallpaper, clothes or hair, remove immediately and wash with warm soapy water