This set of glass coasters is for protecting the floor or can be used to help move a piece of furniture across a carpet. Years ago glass coasters were used under furniture feet or placed under wheeled casters. This set is in excellent shape. They appear to not have been used for there are no scratches or chips.
Each coaster measures 2 1/4 inches across the bottom and 1 3/4 inches across the top. The depth of the cup or coaster is 1/2 inch.