The cards are made of quality material and seam to hold up to my abuse. I wish that the cards did not come with erratas already. There has been a long time since they were produced to fix the errors in the cards and not seem like they ordered a huge batch and did not review them entirely. Because the cards are covered in a laminate material, the erratas are hard to stay on and seem to rub off with any writing device. Hopefully this will be fixed so this problem does not continue for others.