A set of Taigen Tiger 1 RC tank idler wheel arms. These connect the idler arms to the track tensioner bar. These arms are upgraded from the original idlers that originally released with the Tiger 1 tanks. If you have purchased a tank from 2016 onwards you have the new V2. If you replace an arm you must replace the receptical for it as well if you have the V1 of the idler arm. Fits all Tiger 1 models.