Island Print #15 Slip-on Bar Stool Cover 12-15 Inch Diameter (12" Diameter with 2" Sideband) They have a strong elastic side band for a secure, snug fit. Since the base vinyl used is Marine Grade and UV-protective-coated, these covers are excellent for Outdoor as well as Indoor applications. These can be ordered in any quantity desired There is a split in the side band in one spot to allow expansion so that they will slip-on. Returns accepted no questions. Restocking charge 25%. Exchange of size charge additional shipping only.