I buy my kids a lot of coloured pens and art supplies. My daughter wanted a new set of pens to draw with so I got her these, and they have lasted what seems like forever. She carries them around in her bag with her and sketches all the time with them (she's 14 1/2). We have had them for months and they are still going strong. Usually I have to pick up a set every couple of months...these seem like the never ending pen set. Highly recommend.