The paper present investigation results of nanocrystalline composites technology preparation. The composites in the form of rings with rectangular transverse section, and with polymer matrix and nanocrystalline metallic powders fulfillment were made, for obtaining good ferromagnetic properties. The nanocrystalline ferromagnetic powders were manufactured by mechanical milling of metallic glass strips (as quenched and after annealing state). Generally for investigation, Co matrix alloys and thermoplastic and hardening polymers including elastomers were used. Magnetic properties in the form of hysteresis loop, were measured by rings method winded. Magnetic properties of composites materials were compared with properties of cores of nanocrystalline strips and powder cores (rings) solidified by pressing and glueing. Generally, powder cores showed worse soft ferromagnetic properties than the woudn cores made from nanocrystalline strips, however composite cores showed interesting mechanical properties. Furthermore, the efect of strips and powders on properties of composites were investigated.