Comments about Nite Ize Inka Pen Refills with Stylus:

Great design, but terrible ink cartridge. I bought this pen hoping to have something to use on the trail, but this pen stopped writing before completing 3 sentences. I tried later and was able to get half way through a sentence before it faded and died. For the price, we expected more. Based on a cursory search on the Internet, it appears that this is a common problem with this pen. However, if you get the pen, simply replace the cartridge with a Fisher Universal Ball Point Refill. Just remove the stylus from the original cartridge and snap off the end of the replacement so it is the same length. The problem is fixed and now you have a great pen. Refills are less than $2 in office supply stores.