Interior solid wooden door: Skeleton: finger joint hardwood or softwood Core: particle board,tubular chipboard, honeycomb, laminated fir, pine,blockboard, etc Door skin: MDF, HDF, or plywood Veneer:natural veneer or engineered veneer Size: Customized Fire door and reinforced door are available. Frame: available. MDF+face veneer Fir+ (MDF/plywood)+face veneer Architrave: veneer wraped MDF, plywood, solid wood