One of the past mobile phones I have owned is the Sony Ericsson P900, and as they have a very fidly touch screen. Fortunately my phone was supplied with a stylus to allow me to navigate my way around the phone, unfortunately for me i soon lost it. Luckily, Sony Ericsson sell a pack of three stylus' and at just a couple of pounds they are quite cheap to pick up.
Originally when I owned the P900 the stylus' cos around the £15 mark for the 3 pack, but now the P900 is a discontinued phone they are very cheap to pick up. They can be conveniently placed at the back of your phone and allow for a much easier use of the mobile phone. Although I no longer have the packaging, I believe them to be plastic. The main shaft of the stylus is silver, with a grey tip and the top end is also grey. The top end is shaped for easy removal from the back of the mobile phone.
There isn't a great deal to say about the stylus, as it just does a simple job, but they are well made and at the price they are now they are certainly worth buying for use with touchscreen mobile phones. I suppose you could use them with the iphone as to prevent fingerprints accumulating on the screen. A worthwhile purchase.