I was once really into slide guitar, and after enjoying some wine, I made this myself from an empty bottle. It still has the brand label on it. Please peel it off if it bothers you. Inner diameter: φ18mm (thin) - φ23mm (thick) Height: Approximately 63mm, cone-shaped. It's thick and has a good weight to it, and I think it feels much better than the thin, light ones you can buy. There are some chips from when I cut the bottle, but I've filed down all the edges to make them smooth, so you won't cut your finger on them. Enjoy the atmosphere of a handmade bottleneck, just like in the heart of Delta blues. In my opinion, it slides more smoothly than metal, and the sound is richer. Due to the nature of the item, please understand that it is sold as-is, with no returns. Type: Resonator