OrangeTag 50 Amazing XXL Size Grow Water Marbles Beads Color: Multi XXL Size Water Grow Marbles, about 50 balls: Size (diameter): Dry: 0.5-0.6cm Hydrated 3 -3.5 cm. These balls are really cool wet and wacky, soft and squishy, fun and funky, bouncy and beautiful. They start off hard and tiny. Add water and watch them grow to more than 100 times their volume. Eco-Friendly Non Toxic. Reusable up to 2 years Ages 10+