Accord AOBBOL15 Oak Baseboard Register, 15-Inch(Duct Opening Measurement), Light Finish Solid white oak construction; Premium stain and durable lacquer finish Color may vary slightly based on the underlying wood product For floor application; wood flap damper adjusts air flow Listed product sizes refer to the duct opening measurements, not the register itself Actual length of item is 15-inches; inside duct opening measurement of item is 12-inches to accommodate the 1  -inch wide flanges on each end