Marcus & Marcus silicone bath toy is a must have for your little ones! The submarine squirt is made of BPA free and phthalate free silicone. It has a temperature sensitive function by changing color when water is too hot for bathing. It is not just fun to play with but parents are also worry free from mold growing inside as they are detachable to air dry after bath time. "18 Months + Phthalate Free Detachable Design Avoid Mold Growing Design Heat Sensing"