They are the standard hard tipped ones but do come apart easily for refilling. These things are definitely top notch.
I fill a few (20 drops or so), let them set for the day for the liquid to disperse and I can
vape almost a whole day on one carto with a four to five drop top off. Quality hits every time, durable, inexpensive, and I love them!!!! No nasty burnt taste, good vapor every time, and very satisfying.
Waiting on a stock order from Ike right now so I can get my hands on a few more.