Passion Erasable Pen Refills - Soft Black (24-count)

I love these pens. They are my new favorites. But the ink runs out way too fast

The ink isn’t coming out of the pen very well, it writes like it’s running out but I can see the refill is still full. Not as good as the ones you buy with the actual pen

Why are you selling black refills but no black pens? Also, these cartridges cannot be used with the blue pens, so are useless.