It sure is Alloy.With a 12th top in steel..The bag its in feels heavier.
Cant even remember what it was new.Think i paid £70ish.
Was a few pounds lighter then.
Dunno if 14stone is a risk now..!!!?
You can type name of cassette in Google and it show You discussion in Weighweenies on first, guys there used this cassetes. According to most of their words they are generally for racing and in training purposes they are very bad, because they are very, very soft. Don't fight for every gram and buy durable one.