For boats up to 8.5m/28 ft Use size 0 – 1 or Synchro 50mm/60mm blocks. Suitable for 6mm (1/4") control line • For boats with mid-boom sheeting to 130 ft² • Use wih size 0 track • Mainsheet car with Delrin® ball bearings and shackle, with integral control line sheaves for 1/4" line