We do alot of paperwork at work, and we usually have to carry a black pen, a red pen, pencil, and an eraser everyday. It bothers me because it easily fills up the pocketspace. I ordered refills of this in black and red, a 4-slot coleto barrel, the pencil refill, and the eraser refill. It was a perfect combination! You may think that the ink in these refills would run out quick, but you're wrong. They last quite a long time based on my experience with coleto pens. Now, all I bring is one single pen, which makes productivity better. Also, I love how fast shipping was! They arrived within two days of my order. Craftylane is definitely my go-to place for refills soon. <3 I hope you guys restock more of these!