When sourcing auditorium seating, prioritize high-density cold-molded foam (density ≥ 55kg/m³) to ensure long-term shape retention. The structural frame should be made of heavy-duty cold-rolled steel or die-cast aluminum alloy for maximum stability. For the outer shell, high-quality PP (polypropylene) or solid wood veneers are preferred for durability and aesthetics. Additionally, ensure the automatic tip-up mechanism uses a combination of spring and gravity for silent and smooth operation, tested for at least 100,000 cycles.