A Titanium Stop weighs around the same as an Aluminium Stop. The difference between the two is strength. A Titanium is almost impossible to strip a spline unlike Aluminium stops. 

A Titanium stop doesn't lose it's memory or spring so gone are the days of having to use a screwdriver or the like to spread the stop to get it on and off the bar. 

Once you use one of these stops you will never have or want to use any other again!