Without actually eyeballing the cams you really can't say for sure. There's a good chance they are plastic. If they are individual cams joined in a stack on a shaft like my Alden,
then they are not as prone to breaking as the solid cam stacks used on other machines. They are sort of like the flat cams Singer used in many of their machines.
Were I interested in the machine you posted about, I'd take the drive, check it out to make sure it sews on all cams then probably take it home.
Joe