Unit length: 6m Number of seats: 10/row Row height: height of first row is 400, rising height is 200mm. Material : aluminum alloy. Finish:anodized, stoving varnish or natual color Seat plank: 240mm width(hollow plastic seats are optional) Footboards:single footboard 240mm/double footboard 480mm Customization is welcomed: we provide aluminum bleachers of 1 to 15 rows, we also provide professional design service according to your application circumstances.