Microsoft produce something called an easy ball. The ball is somewhat larger than a tennis ball but smaller that a basket ball and the hand fits over it very comfortably. The only downside is that you can only left click (no right click facility) so I do not ues mine. However I purchased it twelve months ago and perhaps the newer models have rectified this limitation. I must say it's a easier to handle for PWP's. regards Mary from Aussie. I have an Microsoft Easy Ball and I use it right handed, even though I'm definitely left handed. I don't know if they corrected their error, or if I'm using the thing backwards, we leftys have a tendency to do such things. Anyway, it works right handed for me.