https://phys.org/news/2018-06-spacex-satellite-ditches-booster.html

The powerful, hefty SES satellite, weighing in at 12,000 pounds (5,400 kilograms), will provide TV and data coverage across Asia, the Pacific and the Middle East.

The Falcon's first-stage booster previously flew last September. SpaceX is switching to a new and improved line of boosters, and so made no effort to recover this one.