Warning: Small parts Not for children under 3years. How to grow up? 1. put the toy in water(note: water temperature below 30 degrees) 2. 12-24 hours later the little things will gradually become larger (Note: to often increase water) 3. 2-5 days later they gradually grew up Material: Rubber Size of about 2-5cm after the expansion to 7-11cm Send in random color. include:50 pcs