Robuta

https://primeline.aldebaranos.com/2022/03/primeline-tubing-is-gold-standard-of.html

https://spearfish.org/%D1%81%D0%BD%D0%B8%D0%BC%D0%BA%D0%B0/%D0%9D%D0%B0+%D1%81%D1%83%D1%88%D0%B0%D1%82%D0%B0/nitrocarbon+speargun/7667