www.amazon.com/Sumind-Acupressure-Massager-Circulation-Acupuncture/dp/B076JBC979/ref=mp_s_a_1_1?ie=UTF8&qid=1525035047&sr=8-1-spons&pi=AC_SX236_SY340_FMwebp_QL65&keywords=acupuncture+ring&psc=1
These are great. Not super sharp by you definitely feel it's there, I like to roll them up and down my finger when I need a more aggressive/painful stim.