Flexible arm 18" in length Adjustable The sleek look of the mounting arm is enhanced by the neoprene sleeve over the flexible portion of the mounting arm. Only suitable for use with the Hydra 32. The AI Hydra Flex Arm is specifically designed to securely hold the new Hydra 32 series of LED lights from Aqua Illumination. The stiff, yet flexible arm gives you complete control over the height and positioning of your LED unit.