A carb cap does just what the name implies, acting as a carburetor and increasing the efficiency of your e-nail. Grade 2 Aerospace Titanium construction to be used with our universal Ti Nail. All of the titanium in our carb caps is Chinese sourced Grade 2 Aerospace Titanium as opposed to US Medical grade. What does this mean to you? For starters it’s the difference of $100 – but in use, you won’t notice a difference. We do not use steel, or other substitute metals – Titanium grades 1-4 are unalloyed and considered commercially pure or “CP”. If you ever have an issue with your nail, contact us and we’ll hook you up. We stand behind our products here at Common Object and personally use everything we sell.