In picasso's masterpiece bull's head, which bicycle part makes up the bull's horns?

Most sculptors use clay. It's squishy, easy to work with, and cheap! We also use cutting boards while making smaller sculptures, and instruments, from things as odd as metal hooks, to something, as easy to find as a plastic knife. Sculptors usually use anything they can find that looks like it could help them, and their own two hands!
1. clay
2. stone
3. chisel