Best used at an RPM no higher than 15,000 but RPM can vary depending on technique and skill.
Soon as I got the package I opened and had to test it. I just say this for me is like a all in one when it comes to doing manicures. Smooth. Don't have to use HIGH speed ( RPMs ) to get the work done. So this is great for beginners and seasoned nail techs a like! Totally recommend!