LPD\'s Georgian doors offer a particleboard core with a primed MDF face. They have 20mm lipping’s on each side, top and bottom (10mm oak + 10mm finger jointed laminated timber).LPD Black Amsterdam Internal Fire Door - 78in x 27in x 44mm (1981 x 686mm) is available to buy online at BSOLPD Doors are one of the biggest manufacturers of doors in the UK, boasting a huge range of Laminated Internal and external doors at great prices its easy to see why they are market leaders. Product Features Face Type - Primed BlackDoor Style - Amsterdam Internal BlackGlazing Type - UnglazedGuarantee - 10 Years