These joint protectors are aluminum alloy. Fits 3/8×10 pins, such as some Jacoby, Lucasi, McDermott, OB, etc.You will receive a standard 2 piece set (1 butt, 1 shaft).These are beautiful joint protectors!The following are cue manufacturers that either currently make or have made cues with radial joints, but there may be others that utilize this type of joint. Some manufacturers change joint types over the years, so please make sure that your joint looks similar to the one above. If you are still unsure, please send us a picture of your joint and we will try to match it for you.5280FalconHunterJacobyJoss WestJuddLambrosLucasiMcDermottOB CuesOlivierRichard Black