I, for one, had never heard that someone made riding whips using the wood of the Hackberry tree.
I was looking at Amandine's blog where she was describing luxury whips.
From there I found myself at the French manufacturer's web site of these rather nice looking riding whips.
There is more general information about the French company that makes these at Esat les micocouliers
They look like seriously well made crops and I should love to be on the receiving end one of these.