While these will hold the product into the tube they aren't made of high-temp silicone and are a little harder to get on and off. Still better than no cap if you have a loaded tube.
In case I lose one somehow. It is very much needed.
It works, but quality wise not quite as high quality as original Arizer one (different material and shape). But it's workable and that's all that matters. Like other posters say, snug fit and can't be stood up due to the nipples.
Tight fit, more snug than OEM caps. Caps accomplish the goal, keep the herb in place. As usual, quick delivery and well package. Puff It Up customer service is top notch.
These caps aren't the same caps I received with my Solo 2 but they work just fine