The rings or tassels seen on some Kung Fu swords serve both practical and decorative purposes. Here are a few reasons why Kung Fu swords may have rings:

1. Visual Aesthetics: The rings add an element of visual appeal and enhance the overall aesthetics of the sword. The movement of the rings during swordplay can be visually striking, creating a captivating effect.
2. Auditory Cue: The ringing sound produced by the rings as they move can serve as an auditory cue during practice or demonstrations. It helps practitioners and instructors to discern the speed, accuracy, and control of their sword techniques, providing feedback on the quality of their movements.
3. Distraction and Misdirection: In combat or performance settings, the rings can be used to create distractions or misdirection. The shimmering and jingling of the rings can catch the attention of opponents, potentially diverting their focus or disrupting their concentration.
4. Cultural and Traditional Significance: Some styles of Kung Fu swords incorporate rings as part of their cultural or traditional heritage. They may have symbolic meanings related to the history, lineage, or philosophy of the specific style or school of Kung Fu.

It's important to note that not all Kung Fu swords feature rings. The presence of rings is specific to certain styles or forms of Kung Fu and may vary depending on the preferences and traditions of the practitioners or schools. Ultimately, the rings on Kung Fu swords serve a combination of functional and aesthetic purposes, adding flair and character to the weapon and the performance of the practitioner.