1. Key stroke comparison: green axis >; Red axis = tea axis > Black axis. Usually, the key stroke of the green shaft is 2.4 mm, while the red shaft and the tea shaft are generally 2 mm, and the black shaft is only 1.5 mm. Different pressing distances will lead to different handfeel, noise and paragraph feeling.

2. Noise contrast: black axis >; Tea axis > Red axis > Green axis. Noise refers to the volume generated when it is used. The sound of the black axis is the loudest and most likely to disturb others. The green shaft has the smallest sound, which is more suitable for use in places with high environmental noise requirements.

3. Contrast of paragraph sense: green axis >; Red axis > Tea axis > Black axis, simply speaking, the sense of paragraph is the intensity of feedback when pressing the key. The sense of paragraph on the green axis is the strongest, and the sense of paragraph on the black axis is the weakest. However, if the sense of paragraph is too strong, it will lead to greater pressure when pressing, so it is necessary to press a distance more when operating, and there is also a gap in experience.