The FLEX BACK Jennifer SA509 is built on a sturdy yet lightweight 12 gauge aluminum frame. The back on the SA509 is unique in that it is designed to flex, adding an incredible amount of comfort while maintaining strength and support. The frame has a durable powdercoat finish. The upholstered back and seat are available in any of our graded-in fabrics, or customers may supply their own material. Stackable up to 10 high, the SA 509 is perfect for meeting rooms, hotel banquet rooms and dining halls. Minimum order 125 chairs.