How to Introduce contact pair for cylindrical objects

Hi everyone,

I have a problem with introducing contact pair for cylindrical object. In the model cylindrical object is overlap by another cylindrical objet. That means in the outer surface for the one object is inner surface for the othre . Both has different mechanical properties.Can I introduce that bounderies as a contact surface?

When I applied contact pair, I couldn't find destination boundaries. Can anyone explain this?

Thanks,