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A bow's central mount for other components (limbs, sights, stabilizers and quivers) is called the riser. Risers are designed to be as rigid as possible. The central riser of a compound bow is usually made of aluminum, magnesium alloy, or carbon fiber and many are made of 7075 aluminum alloy.
Pontecorvo, born in Pisa, was the son of a wealthy secular Italian Jewish family. His father was a businessman. Gillo's siblings included brothers Bruno Pontecorvo, later an internationally acclaimed nuclear physicist and one of the so-called Via Panisperna boys, who defected to the Soviet Union in 1950; Guido Pontecorvo, a geneticist; Polì [Paul] Pontecorvo, an engineer who worked on radar ...