Something every citizen should have!  These cards give you the exact words to decline speaking with law enforcement or allowing them to enter your property, and, as you probably know, the exact words matter.  Simply saying "no" can be construed as "resisting" whereas using the exact legal terminology is enforcing your rights.  

Cards are the same size as a credit card and are made from thicker semi-gloss cardstock.  They are a little less thick than a credit card.  The front of the card is in English, the back is the same verbiage in Spanish.