Cedar Canyon Textiles Artist's Paintstiks Rubbing Plates-Curves

Are each of the designs 7 1/8 square OR all of the designs incorporated into 7 1/8" square?

Can you use these to texture copper sheets in a rolling mill?

Might these hold up to Precious Metal Clay being pressed into them, for texture? PMC3? PMC+? Please don't respond if you don't know :-)

Are these cutable to a skinnier measurement?