1. The solid wood part is 100% solid wood, no veneer, no artificial boards. 2. The main material is black walnut imported from North America, with rich and varied pattern, few scars and no mildew. It is the luxury among the forest. 3. The main material is North American FAS grade ash wood, which has a rough texture, is durable and elastic, and has strong corrosion resistance. 4. Auxiliary material ① is pine wood used for the paneling and paneling supports; it has good strength, stable properties, light texture, straight grain and few knots. 5. Auxiliary material ② is okoume used for the backrest; The wood texture is natural, straight, flawless, without knots, scars and marks, soft, smooth and textured to the touch. 6. The inner part of the fabric pillow: down + doll cotton + sponge (D32 / 8 cm) + sponge (D34 / 8 cm) 7. The inner part of the genuine leather pillow: down + doll cotton + sponge (D32 / 8 cm) + sponge (D32 / 8 cm) 8. The inner part of the back: down + doll cotton + sponge (D20 / top thickness 3.5 cm; bottom thickness 19 cm) 9. The inner part of the armrest bag: down + doll cotton + sponge (thickness D32 / 3 cm)