CR Gibson Sipper Slippers, Slip-On Silicone Stemware Coasters, Summer Tiki A playful, stylish and functional way to add pizazz to your party stemware while keeping your surfaces safe from scratches and water marks A coaster made of stretchy silicone that your stemware base slips into for a secure envelope-like fit Also functions as a drink marker Measures 4 5/16-inch in diameter