[Black Hardware Prehung French Door Collection] 6-Panel Pine Wood Solid Core Double Prehung French Door with Ready-to-Assemble JambSolid core Made of solid CARB P2 certified MDF, 70% more sound dampering than hollow core, energy efficient to lower heating and cooling costs. Finishedpaint grade finished surface ready to use (no paint or stain required), paintable and stainable, the surface is harder than traditional primed and therefore anti scratch. Quick assemble jamb kitJamb kit needs to be assembled quickly with nail guns within 5 minutes. And, there are scale markings on the