We have features a mini stylus for iPad 2, but if you think that stylus is too small for handwriting, maybe the PenNe mini stylus with neck strap can meet your requirements.
PenNe is a shining mini stylus that just measures 1.5 x 5.6 x 0.8 inches. As we can see from the images, the length of the entire stylus is shorter than the width of iPhone 4, and the stylus features an integrated 30-pin connector, so you can easily attach the mini stylus to your iPhone 4, iPod touch, and even iPad 2 in order that you can conveniently use the stylus at any time. And PenNe also features a neck strap made of soft silicone. The neck strap can hold up to 2kg, so you can securely carry your iPhone 4 and the mini stylus around your neck. Apart from that, the adjustment button allows you to adjust the length of the neck strap.
PenNe mini stylus with neck strap is available in 5 colors, including black, silver, blue, green and pink, each stylus is price at $19.4 USD. If you’re interested, jump to Strapya World for more details.