Well you know I'm a dripper. Are these the cartos without any filler? I ask because I'm wondering if high volts would fry it (filler).
yummmm Pollyfill

if you are going to do HV with a carto PLEASE do your lungs a favor and get some Ceramics. There are several vendors that sell the ''E2 Ceramic Cartomizers" they are at version 4 right now, still not perfected, but even at 3.7 still better than any other carto on the market. (a vendor a few lines above FSUSA has 2.5 or 3 ohm for both 510 & 808 connections)