From the product page on Amazon.com:
List Price: $59.99
Price: $19.99 & FREE Shipping on orders over $35
Made from leather with quality construction, this headrest holder provides hands-free backseat access for the supported tablets.
It is very easy to use. Drop the tablet into the holder and close a small strap that keeps the tablet in place, yet it is easy to pull the tablet out when needed. To attach the holder to a headrest, simply pull it over the headrest and tighten a wide Velcro strap. This strap has a strong grip with enough length that will let it be installed on probably any headrest. Openings in the case preserve access to the ports and buttons.
When using a tablet headrest mount with table audio turned on; e.g., to watch a movie, I suggest that you consider using Bluetooth headsets for the back seat passengers.
This product serves its purpose very well and is attractive, too. Recommended.