Love these acrylic pens! I really like these acrylic pens. They are soooo smooth and because they are pens rather than markers, they are much more precise. The colors are vibrant and completely opaque when dry - you are able to go over one color with another color no problem. I’ve used these quite a bit since receiving and have had no issues - they seem to be good quality. I also like that they are versatile. I used them on paper and it did not bleed through. I could see these being so beautiful on other mediums like pottery and other solid surfaces. Highly recommend!