I needed a tool to help me transfer some perfume from its original bottle into a smaller travel-friendly one and this dispensing pump did exactly what I needed it to do. The bag I ordered seemed to have given me a few extra pump pieces, which was a nice surprise, though I will admit, slotting the straw/nozzle into the pump piece was sometimes more difficult than expected as not every piece was perfectly sized.I had very few issues using the pump on my perfume bottles. It worked perfectly fine on 3/4 bottles that I used it on. The one bottle that I had issues with seems to have a larger nozzle than the others, so I couldn’t use the pump piece. It looks like this dispensing pump will be good for most “standard” sized perfume nozzles, but there will be some that will make it hard/not possible to use. At the end of the day, it did what I needed it to do, so I think this was a fine purchase if a small bit pricier than some other listings I saw.TLDR; I needed a dispensing pump to transfer perfume into travel bottles and these pumps did its job most of the time. Pump set-up was simple but sometimes a pain to do. The pumps will probably work with most standard perfume nozzles, but be warned that some nozzles just won’t fit the pumps (or vice versa). Overall a decent purchase, would recommend.