These are ready-to-use indicator systems available in all eight colors.
You get a weighted head, magnetic hockey stick and TWO chains.
The reason the kits come with two chains is so you can use your indicators with any type of conventional bite alarm.
The short steel extension chains are suitable for Delkim sized alarms, whilst the long extension chains are for smaller Neville type alarms.
These kits represent real value for money because they contain everything except the isotopes, which are available separately.
The only question is: which color will you choose?