What are the two primary ingredients composing a supernova remnant?

Answer

The material ejected from the dying star (ejecta) and swept-up interstellar material

A supernova remnant consists fundamentally of the material ejected from the star itself, combined with the surrounding interstellar medium that the expanding blast wave sweeps up.

What are the two primary ingredients composing a supernova remnant?
Spaceastronomysupernovaexplosionremnants