Hydra Roller 64 Microneedle Stamp Serum Applicator HR64 0.25mm

I never could get much hyaluronic acid to come out of the little glass bottle into the roller. I pushed on it, tried it on my hand, rolled it, stamped it, examined it, and did everything I could think of. After spending about five minutes and literally only getting a thin drop of serum one time, I stopped and ended up microneedling in my traditional fashion - with my microneedle pen and a bottle of hyaluronic acid that I smeared on with my fingers. This sounded like a good concept but just did not work for me.