have a first seat height under 12″ and a  6″ rise per row. They have a 11.5″ anodized aluminum seat plank as opposed to the standard 9.5″ seat plank.   This system is designed to meet most building codes without an aisle or rear guardrail.  This type system provides more bleacher seats at affordable prices. These systems are available up-to 4 rows without a guardrail system. A 5 row Low-Rise is available with the same features and includes a unique vertical picket guardrail that wraps around the ends of the top seat.