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 Length: 75mm, 69mm, 62mm, all 3 are conical. *Please allow for slight measurement errors. In my opinion, they are thicker and heavier than commercially available ones, allowing for a longer vibrato and a beautiful sound. These are handmade. There may be some minor imperfections. Rounded edges have been created with files and sandpaper. No claims and no returns accepted. Thank you for looking.