WELLAND 4 Inch x 10 Inch Red Oak Wood Vent Floor Register Self Rimming, Unfinished DIMENSION - Fits a duct size opening of: 4" x 10" (4" x 10" refers to the back insert dimensions PREMIUM MATERIAL - Made of Unfinished Solid Red Oak;Colors may be a slight different due to screen display difference; Easy to stain and poly DESIGN - Self Rimming vent(aka Insert Vent)sits on the surface of an installed floor; Louvered Wood Design;Drop in floor registers APPLICATION - Wall registers; Wood registers; Air registers; Heat registers; Register covers;Floor vent register WARNING - BEWARE of other sellers selling WELLAND vents. WELLAND vents can only be sold by WELLAND