Theirs-Issard can be quite confusing with the descriptions of the blades they offer as they seem to vary from one vendor to the other.

I purchased two special coiffeurs, one in 5/8 and the other in 6/8. The vendor described it as a half hollow. They are good shavers, both have an unusually wide bevel. They blade is stiff and is very noisy ( burned toast) so I am not so sure about the half hollow description really.

Between the two, I prefer the 5/8.