What are synthetic rubbers? Write two examples of them.

(N/A) Synthetic rubber is any vulcanizable rubber-like polymer that is capable of being stretched to twice its original length. However,it returns to its original shape and size as soon as the external stretching force is released.
Synthetic rubbers are either homo-polymers of $1,3$-butadiene derivatives or copolymers of $1,3$-butadiene or its derivatives with another unsaturated monomer.
Examples: $Neoprene$,$Buna-N$.