Review on Assorted Vibrant Acrylic Paint Markers Set: 30 Pens, 3.0mm Medium Tip - Ideal for Rock Painting, Canvas, Glass, Mugs, Wood, Ceramic, Fabric, Metal & Scrapbooking. Non Toxic and Quick Drying! by Gelin Battle

Nice variety of colors but most colors are very translucent so you can't draw your design on stone and then paint over it without a few (I mean several ) to apply layers. The color should be more opaque. I also found that nibs don't last very long, especially if you're painting rocks that aren't very smooth. When the nibs are used up there may still be ink in the marker but it will not flow out of the nibs and if it does it will be rough and uneven or in a large stream that needs to be smudged. They give you 3 extra feathers, which is good, but 3 won't be enough. When I change the tip of a dead marker it works great. If I don't replace it, the marker is garbage. So yes, 3 is not enough. Some colors are shinier than others, and it looks a bit odd to have both gloss and matte color on the same stone. I think I'll try other brands until I find one I'm happy with.