Gpz used to be great when they carried terumo needles. Terumo is the sharpest needles available, and out perform every other brand. I use excel syringes, and terumo needles. Excel syringes have the little nipple on the plunger to push more of the oil out of the hub.
There was a a paper out there that showed terumo to be the sharpest needles i will see if i can dig it up. Terumo are not as easy to find anymore, everyone used to carry them now only a few places.
I cant find the actual study, but this is the basic information from the study published by terumo.
https://www.google.com/url?sa=t&sour...=1584514875005
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