Ceramic Clay - Pottery Clay for Potters (5 lb, Best Mix Plus Cone 5) Ceramic potters clay for pottery wheel throwing. 5 lb size is great for kids. Stoneware clay for kiln firing to cone 5 is water-based and safe for kids Pieces stay attached better, there is less cracking and warping, and clay is easier to throw. Excellent for tableware, ovenware, tile, medium throwing, and small to medium handbuilding. When wet, it is light gray in color, and fires off-white in oxidation or slightly coarse in reduction.