"Great Little Chalk Pens"
Pens are fine and write well once charged (shaking them and pressing in the tip whilst holding upright). As I am writing on a vertical surface (kitchen blackboard) they do sometimes need recharging. I also use them to date tubs of leftovers in the fridge as the details stay put until I decide to wash them off. No more trying to remember when it was that I used half a tin of beans!