Handmade slide bars crafted from processed glass wine bottles. How about a set of 3? Sizes: Small inner diameter: φ18.5mm Large inner diameter: φ22.0mm (varies slightly with length) Lengths: 65mm, 68mm, and 73mm. Cone-shaped. *Please allow for slight measurement errors. In my opinion, compared to commercially available glass slide bars, wine bottles have more thickness and weight, resulting in a longer vibrato and a beautiful sound. The deep green color also adds to the atmosphere! Handmade. There may be some minor chips. R-shaped processing with files and sandpaper. No claims and no returns accepted. Thank you for looking.