Solid wood flush door: Skeleton: finger joint hardwood or softwood Core: particle board,tubular chipboard, honeycomb, 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