These are the new generation, ultra-lightweight, solder-free, tail-mount replacement pieces now used by falconers world-wide. Machined in-house at Marshall Radio from a special aircraft aluminum alloy, then tumbled for a smooth surface and anodized for color and protection, they are 1/3 the weight of the soldered brass predecessor. If you're planning to use a Tail Mount this season, these tiny, lightweight machined parts are the answer for exactness and quality. Using the Genuine Marshall Installation tool, the installation is quick and easy.