Jewel Sun windows & doors adopt the three-layer laminated wood finger joint material. The path slices plank, means the surface breadth and annual growth rings close to 90 degrees, the timber veins presents a straight line. So this kind of timber has high compressive strength, flexural strength and bending strength, and is neither easy to expand when it's dry or easy to shrink when it's humid, nor easy to warp or crack.. The path-cut laminated material not only ensures the unity of stable performance and nice external appearance, but also greatly prevents the defects of the timber from having an impact on the quality of the products.