Roller Weight Tuner Kit - 19x15.5 Over RangeInexpensive variator adjustment kit by Stage6 or Polini . The set consists of 4x6 cores and shells made of very wear resistent plastic that is not affected by temperature changes. The shells are of course also available as spare parts. For better identification, the individual rollers have the weight printed on them, so mixing them up (as it can happen with other sets) becomes impossible. The set comes in a shatter proof box.