This is an optional, low foot for the Korfker Rest. I bought one, then another, for the Korfker for my viola to make the rest as low as possible. But paying an additional 88€ for two optional parts just to get the right height on an already overpriced shoulder rest is not the happiest turn of events. Of course, this is Pirastro's pricing policy, and putting any price they deem adequate is their prerogative. Otherwise, the build quality is great, and the Korfker Rest feet are the best I've seen yet, they really don't budge when placed correctly on the instrument.
So, one star less just because of the price.