Click on image to purchase; this small, round, doughnut shaped pad is actually much pinker than shown in the image. I would not purchase these online, however, unless you're buying a lot of other stuff, because of the shipping fees. These may be found in just about any foot care section of any supermarket or drug store.

See:
Fingerboard tapes and pinky pads
http://beststudentviolins.com/PedagogyTech.html#33