This is a fine grained natural whetstone from France. It is 23 cm long and has a grit of 400-600 and is thus finer than the Bregenzer whetstone. It is named after the village where it is quarried. Just fits in the metal holders. An unusual whetstone made of a schistose sandstone. The extremely thin sedimentary layers in the stone, naturally sandwiched together, give it an unusual feel when honing, like using two different gritted stones at the same time. The soft layer creates quite a slurry, when used.