Horizon Chairs, Plastic, BlackIncredibly strong and durable thermoplastic shell which assures correct posture and provides maximum comfort for sustained periods of sitting Arched back with sculptured cut out provides excellent ventilation Heavy duty welded, unitized chassis designed to enable stacking yet avoids protruding legs Legs made of 16 gauge tubular steel Heavy 14 gauge channel cross braces provide anchor points for the shell Frame is black Seat height: 18" Colour: Black