'PENNSY' O-SCALE RETAINING WING SET - Designed for use as recessed tunnel wings or wall ends. Blends with ALL 'Pennsy' stone block wall components. Sold in pairs. Outside dimensions: 9" W x 7" H x 1/2" thick. 'PENNSY' O-SCALE SYSTEM is a fully integrated system featuring the classic dressed block pattern of the Pennsylvania RR. Each component matches with each other to create a limitless combination of masonry construction. VIRTUALLY EFFORTLESS! FL6150-Cut 'Pennsy' Stone Block Wall, FL6161-Single Track Cut Block Portal, FL6262-Double Track Cut Block Portal, FL6263-Extra-Wide Double Cut Block Portal, FL6191-Stone Retaining Wing Set, FL6158-Stone Seam Sealers Set of 3.