Perfect for pouring fruit fly culture into containrs, for pouring fruit flies into containers quickly, and for other uses for your pets! Always have a funnel when it's needed! Small measures 4" at the mouth, .38" at the tip and is 4¾" tall. Medium measures 4¾" at the mouth, ½" at the tip and is 5" tall. Large measures 5½" at the mouth, .63" at the tip and is 6" tall. They are a must for easily setting up fruit fly cultures.