Richard Mille
Weight
### Weight

In 2004, Richard Mille launched the RM 006 Felipe Massa Tourbillon, which weighed 48 grams excluding the strap, in 2005 the 29 g RM 009 Felipe Massa Tourbillon, and in 2007 the 20 g (including strap) RM 027 Rafael Nadal, with movement made from titanium and LITAL, a lithium alloy used in aeronautics that contains aluminium, copper, magnesium and zirconium.

In 2013 the 18\.83 g (including strap) manually\-wound RM 27\-01 Rafael Nadal Tourbillon watch, developed with Nadal, was produced, limited to 50 pieces. The watch was the lightest tourbillon ever made due to its lithium aluminium movement and carbon nanotube case.

In 2017, at the Salon international de la haute horlogerie (SIHH), the RM 50\-03 McLaren F1 was exhibited, the world's lightest [flyback chronograph](/wiki/Flyback_chronograph "Flyback chronograph") at 38 g (including strap).


What are the benefits and drawbacks of using lithium aluminum in watch movements?