Permanent Makeup tattoo machine 3P needles

Sz 3P sealed sterile pmu tattoo machine needles. Purchased from Amazon as a pack 30 but 29 remain after opening 1 to try in my machine. Turns out I ordered the wrong style for my pen....these are the style with visible threads. I took an up close pic of the needle style I am selling next to the style that ppl, including myself, often get confused. The way the needle cartridge actually attaches to the pmu pen/machine is what makes the difference & is identified by paying attention to the threads on the needle cartridge. I hope this all made sense but if there is any clarification needed please feel free to ask.