Just Think Toys WaterBlocks Bathtime Building Ball Run Just Think Toys WaterBlocks Bathtime Building Ball Run lets kids make water runs, ball runs, waterfalls and more in the bath tub or pool. The "sticky" viscosity of water creates a helpful cling between blocks and the movement. The flow of water adds an engaging twist to classic block play. With these water blocks, children can experiment with their geometry, addition, subtraction, balance, multiplication, division, structure and cause-effect. Age: 4 years and up Features Brings classic block play in bath tub Fascinating, new, watery touch to blocks Water creates cling between blocks Made of mildew and bacteria resistant EVA Contain no Phthalates or PVC Encourages kids to think Helps kids to create their own vision Recommended Ages:3 – 15