Hey guys,just thought i'd post on these cartos I just got from CrystalClearVaping.I use Boge 2 ohm and 3 ohm cartos on my 3.7 volt and VV mods and always buy here cause the prices and service are great.I tried dual coils when they first came out and I guess they weren't perfected yet because I didn't like them at all.I've been hearing many people like these so I added a 15 pack to my order to give dual coils a try once more.I loaded a couple up with my favorite juices and some Boges too so I could compare them.After using both for a while I gotta say I love these dual coils,they win.The flavor they produce was just as good as the Boges and on some juices better,and the vapor was always better on the duals.I don't really understand why they say only for 3.7 volt use on their website because the flavor and vapor really kick in above 4 volts on these things.I put one in my carto tank running at 5 volts and it was awesome.Lots of thick warm vapor and loads of flavor with no burning or filler taste at all.I really think these duals are safe at 5 volts as long as they are kept wet,mine is going on around 10 hours of use at 5 volts with no issues.I'm real impressed with these and will be buying more to stock up on.Later.