They are actually the Crows, I ordered Ravens, it said Ravens on the box, turned out to be Crows, couldn't be bothered sending them back and they compensated me with a quart of Stans sealant.
They are VERY light, a shade over 400g on the kitchen digi's, roll very well at about 25psi. Only a ride or two old, so can't comment further. I suspect they will be quite delicate and bloody expensive!!!!