Review on 🔩 Othmro Mechanical Black Washer Rings by Viswanath Lopez

I bought them to make a dropper on plastic Platinum Preppy Pens. I wanted to use different colors of ink in it and I wanted to use carbon ink in it so I could have waterproof fountain pens. I also converted some nice markers and some nice character markers so I can add some really bold touches to my artwork. They worked great and there is no bulge where I hold the pen. One of the o-rings was a bit twisted into a figure eight in the pocket but I think the o-ring would be fine, I just decided not to use it and I had 50 of them and only 20 pins for the one Price I have paid. It's a lot cheaper than ordering them from a specialty pen store.