30 Mesh Flint Grog (fine)Grog is ground up ceramic that can be added to clay bodies to reduce shrinkage, warping, cracking, and impart visual and tactile texture. This particular grog is 30 mesh, making it a a smaller size of the material. Good for adding to throwing clay bodies. Information gathered from Digitalfire Ceramic Materials Database and The Potter's Dictionary of Materials and Techniques by Frank Hamer. 50# bag; brown bag, red text sticker on bottom 30 MCF