This Buff Grog Clay, like the Stoneware Buff Smooth Clay, has a splendidly developed body, giving a high resistance to warping and cracking and come with a 10% 60s sand added for extra tooth, giving extra strength for larger pots and modelled work.A very plastic general purpose clay, excellent for throwing and modelling, fires to a light grey.Firing temperatures 1140-1260°C.12.5kg pack.