Rolling the masks through with your card will give it a raised feature.
(Always follow your machines instructions for embossing)
Then if you wanted to add more definition to the raised area you could lightly sweep over it with your distress inks to pick out the pattern for a lovely effect.
Using them with Colour core card is also a lovely effect especially if you lightly sand the raised are to reveal the colour inside the card.
Experiment using masks and see what you can come up with.