Sold as 1 Each. Chrome base. 360-degree swivel. Height adjusts in a 5-1/2' range; back measures 16'W x 10'H. Pneumatic seat-height adjustment from 17-1/2' to 22-3/4'. Back measures 16' wide x 10' high. Chrome base with dual wheel casters. Back-height adjustment. Pneumatic height stool with back features 16' round, vinyl-covered seat. Height adjusts in a 5-1/2' range; back measures 16'W x 10'H. Seat-depth adjustment. Includes back-height adjustment, seat-depth adjustment and 360-degree swivel. Chrome base with dual wheel casters.