We manufactured joint rings for billiard cues at the request of a customer! Please check the images for usage instructions! ※The images are for reference. Size: Inner diameter φ10.0mm Outer diameter φ21.1mm Thickness 2.0mm Twilled weave, glossy Set of 4 As a carbon processing specialist, we can accommodate other desired sizes and quantities! [Customer Feedback] Compared to stainless steel, the impact felt on the grip was lighter. I can't quite put it into words, but with stainless steel, the weight of the ball is directly transmitted to the grip, whereas with carbon, the impact felt much smaller. Regarding the intricacies of billiards, I think this is an item that isn't about good or bad, but rather depends on "what kind of feeling you prefer." If I were to recommend it, it would be for female players. It might be easier to make the ball run even without much power.