Campagnolo back in the 10 speed days did a full titanium 10 speed record cassette. There is still some NOS stock available. I have had one of these on my own bike for a while. The sprockets do not seem to wear quickly.
1) 11-23T 11-12-13-14-15-16-17-19-21-23T
2)12-25T 12-13-14-15-16-17-19-21-23-25T weight 154g
There is no lockring with this cassette. It is a ultra drive cassette and will fit on any UD/ED 9/10/11 speed campagnolo freehub body.
Lockrings are available seperately including a Ti lockring which is nice.