Prevent the accidental or unexpected start up or release of stored energy when working on equipment and machinery with thin and flexible 10-mil PF-Cardstock tags for indoor and short-term outdoor use. ACCUFORM SIGNS pulp-free PF-Cardstock tags are more durable than traditional cardstock, and will not crack, distort, or shrink. The matte surface is scuff-resistant and easy to write on with pen or marker. Top has 3/8 plain hole with stronger pull resistance than patch-reinforced traditional cardstock tags.