it looks like I got a bad version of this mouse - with a black wheel - not the same as in the picture. I hope that those who get it with a white wheel will get a surface similar to htc's soft touch, which is much better. this mouse is slightly larger than the X-710F ate: no matter how I scolded this mouse, I had to use it and by now it has served for 7 years, it feels great and is not going to break. I have to give her a high rating for the quality!