I bought these markers for my son's school Artist Appreciation Day. We decided to replicate some famous art on a white t-shirt. They work well and I cant see any problems with them. We also tried them on some worn light denim jeans and some of the colours show up well. Others like grey and purple not so much but on white they all look great.
I like the fact there is a finer nib as well as a thicker marker on the opposite side.
However what pleased me most about my purchase is how fast the delivery came. I placed the order on Friday afternoon. The package arrived Saturday morning.