Comes in as little as 2 rows or as much as 15 rows. Lengths vary from 7 1/2' to 27'. 10" Nominal Seat Planks, 10" Nominal Tread Planks, 17" Front Row Seat Height, 8" Rise, 24" Tread. Accessories list above are: mud sills (2" x 6" nominal pressure treated wood), mobility ( 4" casters/wheels and rubber bumpers), handicap space (Bleacher will have a cut out for handicap accessibility), and guard rail (aluminum vertical picket guardrail). Note that model NR-0815ADV-HC under 8 row, is the one with a handicap spot.