Instruction: Generate an answer to the question by utilizing the information contained in the document.

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Question: what is replacement nib type?
Document: The soft nib on my stylus cracked after 5 months. It still worked, but I replaced it with a hard nib, feels better, seems like it will be more durable. I use the stylus to type on a smartphone touchscreen, because my hands/fingers are big, difficult to type accurately with finger. Someone who does digital sketching or painting might like the soft nib.Go to Wacom.com > Store > Nibs and Ink Refills
I spent a long time online looking for reviews of iPad stylus. I do actually use the stylus for drawing, and occasionally note taking when i don't want to type things in. However, I got addicted to a game and started using the stylus for that game. The constant use and friction I generated destroyed the tip of the stylus and I need to purchase new tips. I would recommend purchasing replacement heads for the stylus when you purchase it.
But the paint chips easily,doesn't come with a replacement nib (or mine didn't....) and the current nib will eventually rip.
I got this on Sunday, and by Friday the nib had torn.They don't make replacement nibs yet.Buy another stylus, this one is too expensive to break so easily.
I would strongly recommend that you don't buy this piece of junk. Wacom has been out of the replacement nibs for at least a month. The original nib lasted 2 weeks. I can't find anywhere else to buy them.
Suggestions: if you can live with all of the above, get it and the nib replacements you like and I recommend Wacom Bamboo Stylus Replacement Nibs, Soft (ACK20501). My more serious suggestion: order a bag of a dozen or two dozen cheapo styli and skip this disgrace.
The only issue I originally had was that while it works extremely well, the nib broke while I was playing fruit ninja...I know, not exactly as it was intended to be used. Then I found out I could purchase replacement nibs, and I'm happy as could be.
Works great with my iPad2. I have no complaints. With regards to the issue of not being able to replace the nib. NOT TRUE. You can replace the nib! Nibs are available in a 3-pack on the Wacom site. Please note that the replacement nibs sell out on a regular basis; order them before you need them.
This is a well made stylus. It feels solid in your hands. The ability to change the rubber nibs is a big plus. My recommendation is to order replacement nibs ASAP because the nib that came with the stylus did not last me very long before it broke. Overall though, this is one of the best stylus on the market.
I purchased this for the compact tip. Other products have a wider tip and wanted something that would allow for finer control for my Dell Latitude 10 tablet. This did the trick and would recommend it to anyone - I also purchased the replacement nib set (3-pack).
Answer: Any that advertise to fit the bamboo. They are all the same size. My favorite is a vendor that sells three firm and three soft. I like the firm and my wife takes the soft tips. I hope this helps.