Shown in the above photo is the Elgato Multi Mount Flex Arm Kit and other Elgato accessories, like Elgato Multi Mount and Elgato Key Light, each sold separately.
Elgato Multi Mount Flex Arm Kit
Here is some general information about Elgato Multi Mount Flex Arm Kit:
Long Tube
24 cm / 9.45 in
Medium Tube
17 cm / 6.7 in
2X Short Tubes
8 cm / 3.15 inch each
Materials
Steel, Hard Composite
Elgato Multi Mount Flex Arm Kit – Setup
Here is a pictorial guide of the setup of Elgato Multi Mount Flex Arm Kit.