Rhinoskin Leather Flipcase for the Palm m100 Series Review It took me a little bit of time to get used to the idea of leather cases being made under the Rhinoskin name, but I am definitely warming to the idea. Marking yet another departure from their famed line of hard protective cases made of aluminum and titanium, Rhinoskin has now come out with a Leather Flipcase for the Palm m100 series PDA. This case is available in both brown and black. For this review, I was presented with the brown version.