Light as a feather and bouncy as a toddler after a birthday party, this putty is so much fun! Mould, shape and play. Keep it in the tub to reuse or leave out overnight to harden permanently. SPECIAL OFFER! This item makes a perfect party bag favour to science up your child's birthday! Order 6 or more and get an extra one FREE for the birthday girl/boy/scientist in your life. Just use code BIRTHDAY at checkout!