It's textured metal, like the knurls on a lens barrel. This particular scroll wheel cover has actually been on the butt end of a lot of jokes and jibes in the Chinese forums. If only we hired AnakChan to be our product photographer Now apparently we have to change the disc texture design (again) or even move to a completely different disc material
May I ask why you changed it from the texture we saw in the original X5 prototype?
(click on images to enlarge)
It looks much more understated and subtly blends-in with the rest of the DAP.
Unless the scroll mechanism is very stiff, I would not expect to need any extra grip than the subtle amount in this picture.
Edited by Mython - 12/21/13 at 11:58am