Task stool. Create spaces with solid or contrasting pairings of polypropylene backs and seats or opt for your favorite upholstered seats for added flare and comfort. The ergonomic perforated back not only offers an attractive design, it allows for enhanced circulation and air flow. The radius conforms to your back for maximum comfort. 15 Gauge Cold-Rolled Tubular Steel Frame High Impact Polypropylene Back and Seat Perforated Back for enhanced comfort Silver Powder-Coated Frames Injection Aluminum Alloy Back Supports 2" Dual Wheel Hooded Casters Upholstered Seat Gas Lift Seat Ht. Adjustment Silver Nylon Five Star Base DS2300 Seat Height Adjust: 23" to 33"