Worst product I’ve ever tried. [SEP] I was really excited about this product, but If zero was an option I’d give it. The pens are black with no way to tell the color inside. It takes a long time for the color to come up, if its not the one you want you have to do it again with another pen. Comes out with all kinds of lumps. Does not dry properly with the UV/LED light. Total waste. Terrible product