150m, 5 pitches.
The British grade is just for the second pitch which requires gear - and is harder and less well protected than the guidebook suggests. Start by walking up rightwards as if going to Balade, but then scramble left up the wide earthy couloir which leads up into the steep gully of the Enclave des Perrons. The actual start is on the little col where you can look down another couloir into the left hand cwm. Take a rack and 2x50. 5b oblig. A topo is to be found in the CAS guide: Du col des Montets au Lac Léman 2003. Descent: abseil down the route. Must be said it's not the best The Perrons can offer... by a long way.
Y Lagesse, J-M Della Volpe, H Duperray Sep/2002