Toysmith Ginormous Grow Sharks One ginormous shark! This shark that starts off 6.5 inches (14 cm) will grow to over 16 inches in about 10 days. Take it out of the water and watch it shrink back to its original size, over time as it dries. Re-grow and re-shrink it again and again. Teaches about water absorbing polymers, increases in mass, measuring and charting, and simply impressive science. Place the Ginormous Grow Shark in a tub or bucket of water and watch it grow over 1.5' long and 9" wide in 7 to 14 days! Choking Hazard, Small parts. Not for children under 3 years.