Plexiglas reflector with a self-adhesive backing. Easy-to-use, just peel off protective backing and press-on to any clean, dry surface. 3-1/4" diameter. 2 per card.WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP) which is known to the State of California to cause cancer and birth defects or other reproductive harm.For more information go to