One of our top sellers. The 14" Hydrobat is the same circumference as a standard wheelhead. It fits on the wheel with bat pins 10" apart. Made of hydrostone plaster for extra strength but the same absorbtion properties as pottery plaster. The Hydro-Bat is made of Hydro-Stone, a gypsum cement nearly ten times stronger than conventional pottery plaster. They Hydro-Bat eliminates the need for wiring off your work by absorbing moisture out of the bottom of your thrown form. Hard rubber grommets cast into the underneath side of the bat will not swell or change shape. These bats are designed to fit snuggly on the standard bat which is 3/8” wide. The 12.5” and 14” fit on wheel heads with pins spaced 10” apart.