Green Global Cooling Flip Flop Coasters - Set of 4 Allow your guests to distinguish their glass in style with these unique and fun attachable coasters for the foot of their glass! Slip a coaster onto the foot of the glass. It will travel with you, at the pool side, in the sand at the beach, and of course at your festive party table Each coaster is approximately 4 1/2" long x 3 1/2" wide and are made of moisture resistant foam and fabric. Designed to fit most stemware.