Nature hard solid wood structure of door leaf Inside filled with high density foam board which covered by 2 pcs 0.8mm steel plate Then reforced by 2layers of strong HDF board. Surface finishing by 2 components UV proof high quality painting. Super security , Sound insulation , Severe whether protection , Warm reserve in winter , Convinience for cleaning , Elegant appearance. Specification: Width : **5mm / **5mm Height: ***0mm/***0mm Thickness: *6mm Hinge: visible Doorsill: Hard solid wood doorsill with anti-slippy aluminum covering.