0.9mm thick, 304 grade stainless steel, wrapped around an 18mm mdf core. Stainless folded on bottom edge with a return at the rear as standard, left and or right sides optionally. Maximum single length 3000mm. If ordering with end folds, deduct 19mm from this number per fold. Maximum height: 100mm. Please see downloadable pdf file (link below main picture.) for advice and instructions on measuring and fitting.