I have a few different ones both delrin & aluminum I like the ones from Colored 510/901 Drip Tips they are shoter then most and you gota like the colors
+1 on this. Yes a bit pricer than some places but the quality is there. I use both 510's and 306's from Nhaler. I have 3 of each and have found the fit on the 306 to be much better than some of the other cheaper ones I have tried
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