I got these pen adapters after watching a few YouTube Videos about using all kinds of pens with my Cricut Maker 3.
I have used them with Crayola markers and Sharpies so far, and they work very well. No complaints whatsoever.
I'm looking forward to using them with more pen sets that I've purchased from Walmart, Dollar Tree and Dollar General.
Below are some pens and their adapter type that are not on Craverland's reference sheet.
Use adapter C with Dyvicl Silver Gel Pens, 0.8 mm.
Use adapter J with Jot Super Metallic Gel Pens from Dollar Tree.
If you can add to the list, please do so in the comments.