Stow's ready-to-use key indicator kits are available in 6 colors, including the heads with weights, the magnetic clip that fits under the detector, and TWO chains. These two chains offer the advantage of making the Stow compatible with all detectors on the market. The chains with the small extension fit Delkims size detectors, while those with the long extension fit smaller detectors, such as the Neville type.
These kits represent excellent value for money as they contain everything you need, except for the additional weights that you can buy separately.
The only question you need to ask yourself is the choice of the color.