Transitional Toddler Cup Spouts: Turn any of your toddler's favorite kids cups into toddler straw cups with these colorful and stretchy Snug silicone sippy cup lids Durable Silicone Sippy Cups: These silicone sippy cup lids are stretchy enough to fit most cup sizes with diameters from 2.5 to 3.75 inches, making their favorite toddler cups easy to take on the go Spill Proof Kids Cup: The Snug straw cup lids keep their favorite beverages in the cup and off of your kids with a tight fit that helps prevent leaks Safety of Silicone: Rest easy knowing these drink lids use a 100% beverage-safe silicone that is made to last and brings a pop of fun color into your day Ready for Any Beverage: The straw hole built into the silicone sippy cup lid fits any size straw for easy sipping of water, apple juice, and other favorite drinks