I have used this carbon tube several times to stiffen FX airgun bodies and make carbon fiber covers. It is well made and the price is very fair. Most importantly, the carbon tube must meet specification. so each liner slides into the next larger size. If needed you can layer the 1mm tube up to 5mm as many times as needed to make it as stiff as needed. I think 2mm or 3mm is about as hard as you need! I am very satisfied with this product. Stoti