These work for a little bit then they just break, so you're left with the pen in your hand but the top has popped off & the inside top bit comes out. It won't go back together so you have to just use the inside ink thing part to just write to use the rest of the unused pen ink which is annoying. It wasn't just the one it was basically every one as I use them. I would not recommend these & I wouldn't get them again either. If I could i'd give them negative stars.