The central line of the bow body is adjusted in the expansion screw mode, with a semi open design, which can be finely adjusted,More suitable for professional players;The mushroom screw at the root of the bow piece is 360 ° infinite rotation type, which greatly protects the bow piece;Aviation grade 6061 aluminum alloy is the main material, and magnesium alloy is the auxiliary material, with scientific proportion;Manufacturing of CNC machining center, forging process;The handle is made of American black walnut wood, with moisture content of 0.6%. It is ergonomically designed and feels comfortable;Anodized bow body surface, coated with frosting, superior texture;