It makes a neat line and the marker is small.

I hate fine line markers for tracing pattern pieces.

I can't speak to how well the lines wash out

so I often erase old lines and make new ones as I wish to change the piece I'm working on

It draws a nice, clean, blue line

The actual pen is a little smaller than I would like, but the line is very clear and the pen itself seems to be long lasting.

Whether they may have the problem of reappearing as a brown line on your quilt many years later as some of the other brands can, remains to be seen but for my purposes they performed quite well

They don't last long, but they are super easy to make your fabric with and the line is fine, but still easily seen.

Compared to the the Fine Line Blue pen, these are way better.

They draw a nice, consistent, thin line

Bright, consistent lines

It makes a nice line on my fabric thick enough to easily see yet thin enough not to be blurry.