The consists of a 3.25" twist-lock suction cup base, short size double socket arm, and 1" rubber "B" size ball with custom GoPro Hero adapter. The mount is designed with adjustment points at both ends of the double socket arm; this allows for almost infinite adjustment and perfect viewing angles. The suction cup, twist-lock base is designed to have a strong hold on glass and nonporous plastic surfaces, including RAM adhesive disks. Compatible with all HD HERO Original + HD HERO2 professional cameras. Constructed from high strength composite and powder-coated marine-grade aluminum. Adjustment points at both ends of arm High strength composite construction | Mount GoPro HERO Suction Cup Mount