Includes 1 Piece. This stool cover is made to fit our Therabuilt 15.3" Diameter, 4.25" Thick Foam stool seats. It fits tight, you have to stretch it over the old seat. This stool cover can be used to cover your worn out or stained seats on your bar stools at all seasons. It also protect your new stool from Wear and tear. It is made from waterproof PVC surface fabric to ensure your comfort and for maximum durability. Note: Please check the size of the seat on the stool these are going to be used on, before completing your order.