Priced and sold as a set of 4, these portable chairs are made of 70% polypropelene and 30% fiberglass for strength. The chromed steel legs are 5/8" in diameter and 1.8 mm in thickness. Fully welded base. Stackable too - what more could you ask for?! Lead time is 1-3 days; assembly required. Ships via UPS/FedEx. Since their inception 30 years ago, this manufacturers philosophy has remained consistent: to offer their customers the best possible design, at the best possible price, quality and value. Dimensions: 21"W x 21"D x 30"H; seat height is 18".