From the Frachi website (US)

* Front Inertia
* TSA - TSA_ADV
* Total Gel ABS
* Optowood
* D 4 use
* Benefits
* MAINTENANCE

Optowood

It is a wood surface treatment created with the use of innovative laser technologies. These processes allow bringing out the original wood grains without compromising wood resistance to weather and time. It also maintains a balanced weight reduction and, last but not least, it improves the overall aesthetics of the shotgun.