The silver ring depicted in the Spaceflight illustration above is an ESPA ring developed by Moog under a U.S. Air Force contract. The black ring is called Hub and was manufactured by Airbus Defence and Space. It is similar to the ESPA Grande payload adapter.
Glavkosmos Soyuz smallsat launch
Spaceflight President Curt Blake at the Small Satellite Conference at Utah State University in Logan, Utah. (Keith Johnson for SpaceNews).
An ISRO Polar Satellite Launch Vehicle lifts off Feb. 14 carrying 104 satellites on a single rocket. Credit: ISRO
Glavcosmos smallsats
Clay  Mowry speaking at a space industry event in 2015. Credit: Tom Kimmell