Thank you for viewing. This is an original, custom-made aluminum alloy product, with improved design, durability, and feel compared to conventional carbon fiber versions. Our extensions feature a double-link design, offering both superior aesthetics and practicality compared to older models on the market. ★ Billiard Musashi Cue dedicated bolt, brand new, unused. ★ Bumper bolt weight: 17g Please feel free to ask any questions in the comments.