Run a smooth after school program by having plenty of these heavy-duty plastic stack chairs around rambunctious kids who tend to be tough on seating. These classroom chairs are comfortable with an air-vented back and waterfall seat edge to put students at ease while learning. The 16″ seat height is ideal for 3rd – 7th Grade students. These school stack chairs are built to last with a dual braced frame that can hold up to 661 pounds. School maintenance workers can appreciate student chairs that can stack for floor upkeep – these student desk chairs stack up to 15 chairs high. We consider this student stack chair to be the premier stack chair – essential for every school and classroom setting.