The Hayward AXV014P Replacement Pod Shoes fit the Concrete and Gunite model Hayward Pool Vac and Navigator pool cleaners. These shoes are for use in concrete and gunite pools and there are four shoes in the set. The shoes have wear indicators on their sides and should be checked occasionally to determine if they need to be replaced. The wear indicator is a line of the side of the shoe that appears as a difference in texture. When this texture is no longer visible on the shoe when viewed from either side the shoes must be changed.