Alvin - Drafting Budget Task Chair - Black - The Budget Task Chair from Alvin is an affordable, sturdily-constructed task chairs are perfect for home, office, or student use. Features include pneumatic height control, polypropylene seat and back shells, a height and depth adjustable hinged backrest, dual-wheel casters, and a 22 inch diameter reinforced nylon base. Molded foam seat cushion is 17w x 16d x 2+ thick. Backrest is 16w x 12h. Office model height adjusts from 16+ to 21+. Drafting model includes CK38 height extension kit and adjusts from 24 to 29 inches. Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Creative Coldsnow is a pround retailer of Alvin graphic arts, drafting and fine arts products.