The black knight magnum corona 6 pack includes two quality squash rackets built with ultra thin nxs nano fibres and the 16k fibre used for greater durability the rackets have undergone the thermal core process that strengthens and stabilises their frames and have also been analysed under stress at 6 key points to fine tune them until the best performance results are achieved the magnum corona 6 rackets are an excellent choice for advanced players or professionals who seek a frame that can impr