126g incl lock ring but I will go for 7sp or 8sp setup

 And how much did it cost to you ? I really want black colored cassette, so I'm thinking about Driven one, but it weight almost 2 times more than this.

 I got a good deal for 110EUR but the normal price is about 400EUR/$500 these TISO cassettes.

 All drivetrains will wear since they are just moving parts,but on a DH bike they don't wear as fast like the drivetrains found on XC,Trail,CX & Road bikes.

 Yeah but if you were running a steel chain with a titanium cassette and chain ring, it would wear them prematurely because it is a harder material.

 So steel on steel,titanium on titanium when it comes to drivetrains on wear.