Current transformer core CT cores Nanocrystalline cores

 The core wrapper by epoxy, if you no need plastic wrapper, The customer can choose this type..

Nanocrystalline current transformer core, with moderate saturation magnetic induction, high permeability and low core loss. 

Nanocrystalline soft magnetic alloy features initial permeability and temperature stability near to and density and lamination factor lower than that of permalloy. Under the same condition of core size and properties, the nanocrystallite cores feature lighter weight (about one-fourth) and lower cost than that of permalloy cores.