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: 66mm, 69mm, 72mm (3 pieces), conical shape. *Please allow for slight measurement errors. In my opinion, they are thicker and heavier than commercially available products, allowing for a longer vibrato and a beautiful sound. Handmade. There may be some minor imperfections. R-shaped processing with files and sandpaper. No claims and no returns. Thank you for looking.