Mommy's Helper froggie collection tub water temps can help prevent the severe injuries that can occur when tap water gets too hot at bath time by helping you set a safe water temperature, and their non slip surface helps reduce the risk of slipping. The lines on the temperature sensitive applique change from blue to magenta to alert you that water is too hot before you put baby in the tub. Includes 6 frogs 1 color changing frog and 5 non slip frogs and 3 non slip strips for top edge of tub wall. Easy to install self adhesive backing.