I saw this view on weightweenies.starbike.com, UTmtnbiker wrote:

I've been riding some 38mm and 50mm tubuilars from ACEBIKE Stefano for about a year, which weigh in at 1340 and 1460g respectively. Been very happy with them, nothing out of true. I've actually found them to be more durable than my Zipp 303's, which have had the front rim replaced from hitting a pot hole (of course, significantly lighter wheelset).