This is a bass saddle from Freedom Custom Guitar Research. This brass saddle allows you to modify the string spacing of a bass with 19mm string spacing to 20mm without any special modifications, and is standard equipment on Freedom basses. I bought it new and tried it once, but ended up putting the original saddle back on, so I'm selling it. I haven't used it for very long, so I think it's in good condition, but it's not new. Thank you very much.