The Low Twist X3 unit is essentially an unrolling device, utilising an optical sensor system to ensure that the rotation of the package is synchronised with the weft insertion speed of the loom. This application is specifically designed to improve the weaving of metallized polyester film e.g. Lurex, since it can reduce the twist from ribbon yarn when being drawn from the package. The Low Twist X3 unit must be installed behind a weft accumulator. The new model Low Twist X3 unit connects to the same Voltage supply box of the X2 / X3 generation of weft accumulators.