The Hydro-Bat is made of Hydro-Stone, a USG product containing cement and crystalline silica, that is 8 to 10 times stronger then pottery plaster. The surface is scratch resistant yet absorbs water like plaster eliminating the need to cut your pieces off the bat with a wire.
The Hydro-Bat was designed to fit on wheel heads that have bat pins spaced 10 inches apart on center. The hard rubber grommets cast into the underside of each Hydro-Bat will not swell or change shape and are sized to fit over a 3/8" diameter bat pin head. These bats must be wet prior to placing clay onto the bat for throwing.