The original nose bridge is usually made of silicone??

I just got a consultation for my first nose job, and
 the estimate is
 silicone for the bridge of
 my
 nose, ear cartilage for the tip of my nose, and septum or autologous rib for the pillar. I asked them to use autologous rib instead of donated
 rib since I was worried about the side effects of autologous rib
 . However, during the consultation, they adjusted the bridge of my nose with Photoshop, and
 even mentioned using autologous rib instead of septum, and since silicone
 wasn't mentioned much, I thought it was a non-prosthesis, but when I later got the estimate, it said
 the bridge of my nose is silicone.
 Is it common to use silicone for the bridge of my nose??
 Or is there a better way??
 I'm the type who worries a lot about side effects, so
 I'm really worried about silicone ㅠ