We manufactured washers for billiard cues at the request of a customer! Please check the images for usage instructions! ※The 1st and 2nd images are for reference. Size: Outer diameter φ21.4mm Inner diameter φ9.5mm Thickness 4.0mm Plain weave, matte Set of 2 As a carbon processing specialist, we can accommodate other desired sizes and quantities! [Customer's Impression] 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, that impact felt much smaller. Regarding the intricacies of billiards, I thought this item wasn't about good or bad, but rather "what kind of feeling do 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.