This is double faced fro two sided adhesion, it is 7 mils in thickness.  It is guaranteed not to bleed, run, fisheye, or bubble.  It has an 18 month shelf life, and it has super tac adhesion for extra holding power.  Each roll comes packed in an durable hangable box .  This tape is good not only for carpeting, but for throw rugs on wood floors, hanging wall tapestries, or holding down shelf and drawer lining paper.