Where are they made? I assume that they are made out of titanium. Right?
The landing gears are manufactured by Messier-Dowty, a Safran group company. According to their site,
Safran Landing Systems is responsible for the design, development, qualification testing, manufacture and support of the main landing gear for the A350-900 aircraft.
Safran Landing Systems also provides wheel and carbon brakes for the A350, as well as the landing gear extension-retraction system, monitoring system, steering system and braking system.
The landing gear design does use large amounts of titanium:
The A350-900 main landing gear ... includes the increased use of advanced materials, in particular high strength titanium, corrosion resistant steels and HVOF coatings.
A350 landing gear materials, from A350 XWB family & technologies