Melsur® solid plastic, 5/8" thick, made of wood flour and Melamine resin in a binder component to assure a durable, smooth surface. Seats are 12-3/4"diameter and are attached with four (4) screws. Formed of heavy 18 gauge 1-1/8" diameter steel tubing legs. A 16 gauge round tubular steel foot-ring, positioned for comfort and stability, surrounds the legs for additional strength. Four adjustable chrome plated silent, rubber cushioned swivels of self-leveling 1" minimum diameter hard carbon steel, nylon base type with a flat bottom. Available Options: Steel glides, Q-ball glides, Boot Glides Available Sizes: 18”, 24”, 30”, Adjustable height stool adjusts from 18" to 24" and 24" to 30".