Staples used to sell Duramark ultrafine permanent markers they were great. Apparently these replace them at least from what the store person told me. They don't seem nearly as good the first one came apart at the innards rather than the cap coming off - not great. They don't mark as well either. I'll be buying Sharpies instead.
I bought this as a replacement for one of my Sharpie thin point favorite pens thinking they'd be the same. They're similar but this one is very uncomfortable to hold because the edge where the cap clips back on digs is right where I hold my pens and it digs into my fingers. Bad design. Would be better if they got rid of that ridge.