1.Solid wood door 2. ROTO hardware 3. Insulation glass wooden ... , such as larch, spruce, oak and Catalpa as laminated wood. 3. German brand Environmental-friendly Water-based paint, using ... 6 hollow glass, sound insulation performance 32dB.7. Solid wood main structure with ordinary hollow glass configuration, heat conduction ... large opening area, good areation and light transmission. Solid wood door