Description For General Concrete Work, Setting Posts, Or Building Sidewalks, Steps, Patios, Downspout Troughs, Floors, And Curbs. Activated With Water. 4,000 Psi Average Compressive Strength. WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer, birth defects or reproductive harm and Butyl Benzyl phthalate (BBP) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov