1．The beam and inclined frame of W152 dorsal column remained stable at the piano strings under tension.
2．WL120 is not only in line with the piano industry requirements, but also to protect the product quality and stability by applying CNC five - axis machining bending.
3．The drilling work on the iron plate of WL120, the milling of the string reinforcement and the connection between the components of the sound source are completed by the high-tech CNC control equipment. It controls the manufacturing accuracy and controls the quality of the piano.
4．Hailun's piano makes the assembly precision to meet industry standard requirements through the temperature control and humidity of the wood and workshops, Hailun's the unique positioning patented technology and the CNC processing technology from Japan. So that it controls fundamentally the stability of the piano. And so does WL120.
5．The keyboard of is HAINSWORTH felt from the UK, which has good weatherability, so that the piano can be stable in different environments.
6． The hammers of WL120 are made from the ANBIC hammer felt from Japan, to make it soft. The ROSLAU high strings from Germany can ensure the soft tone and the good overtone of the strings while playing.
7．Hailun piano's ribs and other wood parts are selected from various woods in northeast China. Solid wood string code is conducive to transmission of sound.
8． The maple hammer handle and alder hammer wood core of WL120 can ensure the soft tone and the good overtone of the strings while playing.
9. The tuning peg of WL125 uses chamfer threading technology so that the tone is smoothly without noise.
10. The string axis of WL122 is made of 18 layers of maple. And it is stable and firm.
11. Automatic friction of the string machine weakens the string stress, and ensures a longer and more stable tone.
12. It is equipped with color wooden multi-layer aluminum alloy adjustment file (shrinking stalls) to increase the stability of piano work.
13. WL122 is equipped with a weak sound file that is beautiful and generous. It has rational angle location and no noise in the tap linkage system.
14．The effective chord length of a string is 1190mm. Hailun added an effective chord length, which makes the bass extension longer and more penetrating.