SeaSucker Tumbler Ring Black. ) and SeaSucker has gone the extra mile to make sure your favorite drinkware is secure on the boat. Instead of letting your tumbler flop around in a standard 3.5in cup holder our new Tumbler Adapter Insert gives your tumbler (Yeti yes but also many of the copycats and emulators too) the gentle but snug caress it deserves. This item is just the Tumbler Ring and does NOT include the cup holder insert. This Tumbler Ring is sized to perfectly fit the cup inserts used in SeaSucker cup holders - other brands and styles might not match. Specifications for SeaSucker Tumbler Ring: Manufacturer: SeaSucker Size: One Size Package Contents: SeaSucker Tumbler Ring SeaSucker CX2306B: Tumbler Ring Black