Disposable Silicone Drip Tip for Uwell Caliburn Sealed Individually - 50pcs Pack

So these go over the mouthpiece. I thought these would replace the black cap which would make sense because it would be easier to take it of. These slide over the existing mouthpiece! They don’t fit well either so they basically just fall off!!! What is the point of this product. The description in the listing wasn’t clear about this so now I am basically stuck with a load of junk. Straight to the bin absolute rubbish