Alera Oversize Stack Chair, Black Antimicrobial Vinyl Upholstery, 2/Carton Sold as 2/Carton. Extra-wide seat with waterfall edge has a 3-1/2" foam cushion for all-day comfort. Durable 18 gauge, 1" steel frame with front and back stretcher bars for added strength. Stacks up to five high for space-efficient storage. Built-in ganging feature secures multiple chairs.