My workplace started buying products from Niceday some time ago, including these Permanent Bullet Marker pens. They are great for offices as you can order them in boxes, and they are very affordable. They are a good product to have in your desk in case you need a permanent marker, and they are as reliable as I could have hoped.
I have a few of these in my desk drawer at home, and when I was in need of a marker pen a few days ago I went and grabbed one. I had bought it a good three years ago, but I had barely used it. I did expect it to have dried out as I had taken the top off to use it a few times over this period, but it was still really inky, as though I had only purchased it that day.
They’re the ideal pen for keeping in the drawer if you need one every now and again, but they aren’t so good if you use one every day. When I use them at work I don’t find they last very long before they start drying up, so for that kind of use there are better markers available to buy.