Here is how to throw a platter on a Hydro-Bat hump mold. Hydro-bat hump molds are contoured domed bats that connect to your wheel for reverse-throwing plates, platters, and bowls. We were able to create a beautifully finished platter with ease using the Hydro-bat. Watch it today and see the polished results you can achieve using a Hydro-bat hump mold.