Handmade slide bars / bottleneck made from processed wine bottles. How about a set of 3? Sizes: Thin inner diameter: φ18.5mm Thick inner diameter: φ22.0mm Lengths: 79mm, 75mm, and 66mm. All three are conical. *Please allow for slight measurement errors. *The thick inner diameter may vary slightly depending on the length. In my opinion, they have more thickness and weight than commercially available products, allowing for sustained 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.