Yes, they are!

It’s important to note that there are 3 types of Cricut pens. 1) Basic pens 2) Cricut Joy pens 3) Cricut Infusible Ink pens. Cricut Infusible Ink pens are permanent once they have been applied and heated according to product instructions. The ink from the other two types of pens are considered permanent once the ink has dried.

Here are our recommendations: https://makersgonnalearn.com/where-to-buy-blanks-for-cricut-projects/

You can learn all about the Cricut Mug Press here: https://makersgonnalearn.com/all-about-the-cricut-mug-press/