I bought 3 attys that had the brad kingpin on them that I used for dripping. The first had no brass coloring down the length and I used it for about 6 months until it stopped giving good hit/flavor. The others had a brass band about 25% of the way down the side and only lasted about 3 weeks until the produced little flavor/hit and were hard to draw through. Since they were the same order I don't know if there is more than a comestic differance and I don't even remember where I bought them from, being about a year ago. I would appericate if anyone could give me some advice for finding a 510 atty that gives strong hit/flavor that dosn't need replaced every month.