These are a special set of race wheels! They are ridiculously light and have a really unique feel to them on bumpy and rough courses. The increased compliance in these wheels give them an advantage over bumpy courses and they maintain traction very well through corners or when braking/accelerating. They spin up SO FAST and drop a ton of weight out when shouldering the bike. I've ridden a number of the top of the line tubular race wheel sets over the years and these perform as well if no better than wheel set costing twice as much.
I recommend this product
A Special set.