Exterior Plywood Stocking Grades & Sizes: 3/4" 4' x 8' A-B Marine Plywood 3/4" 4' x 8' A-C Fir Plywood 5/8" 4' x 8' C-D-X Plywood 3/4" 4' x 8' C-D-X Plywood 5/8" 4' x 8' Sanded Shop Plywood 3/4" 4' x 8' Sanded Shop Plywood