Kirby's sculpture is based on the famous helmet found in the Sutton Hoo ship-burial, but is rendered on a much larger scale.[19] It is made from 900 kg (2,000 lb)[1] of mild steel plates that have been coloured red, and is 1.8 m (5.9 ft) high, 1.2 m (3.9 ft) wide, and 1.6 m (5.2 ft) deep.[13][20] The external structure rests on an internal steel frame.[13] By contrast, the actual helmet is 31.8 cm (12.5 in) high, 21.5 cm (8.5 in) wide, 25.5 cm (10 in) deep, and originally weighed an estimated 2.5 kg (5.5 lb).[21]