I just got an order in today from FreedomSmokesUSA, and on a whim I had added a couple of 510/901 black delrin drip tips to that order. I use KR8 cartos and often burn my lips on them after a few good vapes on my PT. The 510/901 tips fit perfectly into the ends of the cartos and keep my lips from being burned. I also find that I'm getting less juice spillage than I did when using the standard soft white tips on cartos.
If you use kr8 cartos, consider getting some of these drip tips even if you're not dripping.
If you use kr8 cartos, consider getting some of these drip tips even if you're not dripping.