Amazon.com: FLEXTRIM #1X4: Flexible Flatstock Casing: 3/4" Thick x 3-1/2" Wide - PRE Curved to fit Half Round Arches 67" Diameter up to 84" Diameter : Tools & Home Improvement
Severe Weather 1-in x 4-in x 12-ft Appearance Southern Yellow Pine Pressure Treated Lumber in the Pressure Treated Lumber department at Lowes.com
Maple Board (Common: 1 in. x 4 in. x Random Length; Actual: 3/4 in. x 3-1/2 in. x Random Length) 1041220 - The Home Depot
1 x 4 x 16' #2 White Pine Lumber - Schillings
1x4 #2 Yellow Pine Lumber, S4S | Capitol City Lumber
1 in. x 4 in. x 6 ft. Common Board 914673 - The Home Depot
Sutherlands 1x4 16 1 x 4-Inch X 16-Foot Standard Better S1s2e Cedar Board at Sutherlands
1x4 - 10 Ft. Premium Allwood Pine Board | Dealer Pack 800 board feet