Handmade slide bars / bottle necks crafted from processed wine bottles. How about a set of 3? Sizes: Small inner diameter: φ18.5mm Large inner diameter: φ22.0mm Lengths: 73.0mm, 70.0mm, and 65.2mm. All three are conical. *Please allow for slight measurement errors. In my opinion, they are thicker and heavier than commercially available ones, allowing for longer vibrato and producing a beautiful sound. These are handmade. There may be some minor imperfections. The edges have been rounded with a file and sandpaper. No claims or returns accepted. Thank you for looking.