Thank you for viewing. I was taking videos of my ride with adjustable angles. It was convenient when the navigation screen was difficult to see with the setting sun behind me. I am selling it because I sold my motorcycle. There is only one ball. Please be aware of this. This is a "Dual Pivot Arm - Medium Size" made by Quad Lock. It is compatible with 360 mounts and is a medium-sized arm that allows you to freely adjust your smartphone to your preferred angle. Flexible adjustment of angle and position due to the double joint structure. Sturdy and lightweight design. Can be attached to the handlebars of motorcycles and bicycles. Compatible with other Quad Lock mount accessories (360 compatible). Specifications: • Product Name: Dual Pivot Arm Medium (Medium Size) • Condition: New / Unused • Contents: Arm body (*Mount and base sold separately) Please understand that this is a used item. The package is a reference image.