These bleachers have a chainlink guardrail across the back and down each side to row three. There is a 1 in. by 6 in. riser plank on row four and above with a 2 in. by 10 in. riser plank on the top row. Unlike the standard series, the preferred bleachers have double foot planks on every row. The first row seat height is 17 in. with an 8 in rise for each row. Assembly required.