SRUBEK is an all Grolleg kaolin, NO ball clay .2-5 formula. Sold in 25lb increments. ABSORPTION: 0% SHRINKAGE 12% Penetrometer: 6.5
WARNING: This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.