Extralite finally made a new MTB handlebar. Their old is pretty slim and only for 25,4 stems. So now a new Hyperbar in three widths and types:
5mm up or 5mm drop:
Available in widths of 650, 700 and 750mm. Can be shortened to 550mm (why?)
The lightest, Hyperbar UL is 93g in 750mm
and then there is Hyperbar BEC (for barends),106g in 750mm.
Lighter than Tune Türnstange but as good?
More info here: Extralite