Universal tablet holder, top quality. Ball joint: 1.5-inch rubber ball. Suction cup with a diameter of 8.4 cm. Ideal for smooth glass and plastic surfaces. Made from powder-coated aluminum and high-strength composite materials. Weighs 159 g. The RAM Mount mounting system is modular in design. Each holder consists of a base, an arm, and a headpiece. Depending on the holder, these are either screwed together or typically connected via a ball joint. This provides flexibility in positioning and, along with the material, offers a shock and vibration-damping effect.