ABOUT SAY-CORE ? SAY-CORE 6", 8", 10", and 12" planks are extruded precast/prestressed hollow core 4'-0 wide slabs which are fabricated using the state of the art SAY-CORE extrusion process and machinery. Slabs are manufactured by skilled PCI Certified Plant technicians at our plant under controlled conditions using SAY-CORE PCE Elematic self propelled extrusion machines, placing and vibrating...