Terahertz radiation, ranging in frequency from 0.1 to 10 THz, have attained significant potential for diverse applications in imaging, communication, and sensing. However, traditional fiber materials exhibit high absorption and dispersion at THz frequencies, limiting their effectiveness as waveguides. In this work, rectangular metal wires based on metamaterial hollow core fibers for terahertz (THz) applications are designed and analyzed. COMSOL Multiphysics was used to model and investigate the optimal metal selection for metamaterial-based hollow core fibers intended for THz applications, specifically for frequencies between 0.2 and 1.6 THz. The confinement loss spectra throughout a range of frequencies are carefully investigated, and a low loss of about 1.6435 dB/cm for gold material is found at 0.2 THz. Furthermore, the effects of numbers and types of metal wires, metal wire distance from the core, and wire diameter are investigated.