Just about anything other than cheap paint as usual. Its not very picky on paint so thats a plus.
Strengths:
This barrel is fairly decent for what it cost me. The shots somtimes curve on my gun and the distance is limited compaired to some other barrels I've tried. The shots are surprisigly quiet! Almost as quiet as my whisper. That was always a plus. Nobody I played with had ever seen one, so they would always oo and ahh when I walked onto the field.
Weaknesses:
As I said, the balls somtimes curve and go all wonky on you. Occationaly chops paint... and the distance isnt all that great.
Conclusion:
This barrel is a better than average barrel, but... not the best barrel. Because of that, I'm giving it a 7
