S4S means this hardwood has been surfaced on all four sides. This board has a cleaner appearance than S2S1E.
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Joey Perot on LinkedIn: Presentation matters… Great job by the folks over at World Wood!
Mouldings and S4S Products
Poplar S4S hardwood is stocked in 2 thicknesses in widths from 4 to 12. Clean dressed on all four sides with square edges. Lengths can vary and sold
Poplar Hardwood S4S | Capitol City Lumber
Domestic Hardwood Lumber - Discount Lumber Outlet - Your source for Dimensional S4S Hardwood Lumber Savage, MN - Discount Lumber Outlet - Flooring, Domestic Hardwood and Exotic Lumber, Trim and Moulding Source in Savage, Minnesota
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S4S Hardwood Bundle: Wenge, African Mahogany & Curly Maple Perfect for Cutting Boards Twelve 12 Pieces 24L X 1.75W X 0.75T