Handmade slide bars / bottle necks crafted from repurposed wine bottles. How about a set of 3? Sizes: Small inner diameter: φ18.5mm Large inner diameter: φ22.0mm Lengths: 79mm, 75mm, and 63mm. They are conical. *Please allow for slight measurement errors. *The large inner diameter may vary slightly depending on the length. In my opinion, they are thicker and heavier than commercially available ones, allowing for sustained vibrato and producing a beautiful sound. Handmade. There may be some minor imperfections. Rounded edges have been created with files and sandpaper. No claims and no returns. Thank you for looking.