These Shhh pens are great, the CO2 oil is potent as hell, and its a cleaner hit than shatter.
The tips are for sale separate and can be filled by the user with another vape-friendly concentrate.
When more expensive pens come around, they tend to make the process complicated. We've seen blinking lights, coloured lights, all sorts of combinations that have done nothing but confuse me before I figured out how to hit it. Not these guys, easy and effective.