Bought these only because the permanent markers I usually buy were out of stock. Glad they were. These 'generic' ones are surprisingly good for cardboard box marking with bare/ untreated surfaces. Have a dark intense black with a sharp edge on the line. Yes would recommend them to a friend.
These markers are great on white boards vs. the market leader and offer a good value. They also seem to stay moist and useful for a longer time than the big guy's product.