Low Relief Retaining Wall Arch Kit OO Gauge (3 Arch)OO Gauge Low Relief Triple Single Arch Retaining Wall Laser cut kit of 2mm MDF and grey board Simple layered construction with a choice of top wall style and the option to include 'j' type cable hangers Plain Top Wall Standard brick bond etched pattern Relief Top Wall Brick pattern overlay creates a recessed 2mm deep frame with brick pattern behind Embossed Top Wall Etched frame of a single course of bricks, usually made from a complimentary brick