Throw away those old, gunked up rubber rings on your Corkcicle Tumbler and replace it with a new seal! Choose the size of O-ring to fit a 12 ounce wine tumbler, 16, or 24 Ounce Tumbler, or any of the Corkcicle Canteens! Simply pull off the old ring then stretch the new ring in its place and let it seat in the groove for a perfect seal. Each package contains three new seals. Lid and tumbler sold separately.