6 inch Low Rise Bleacher frames have wide 2 x 12 inch seat planks. The wider seat plank low 12″ first row high and anti-climing vertical bar guard rails make this bleacher child friendly. These bleachers meet the requirements of most buidling codes to be exempt from needing an aisle. top row has a riser between the foot and seat planks for additioanl safety. Check your local building code requirements.