Searching for Jacksonville ready-mix concrete dealers? Look no further! We deliver ready mix to commercial and residential sites. Hard-Rock Materials, Inc. of Florida produces and sells concrete ready mix, and slab pack.. Hard-Rock Materials,Inc. of Florida produces and sells concrete ready mix,concrete block,and slab pack. With our growing fleet of concrete mixing trucks,we deliver to all areas in Northeast Florida,including Jacksonville,Orange Park,Green Cove Springs,Middleburg,Baldwin,St. Augustine,Keystone Heights,and Palatka. Our concrete production facilities are in Green Cove Springs and Baldwin.