Objective: The development of a more stable and accurate guidewire for localization of nonpalpable breast lesions during biopsy. Background: Breast cancer, the second leading cause of death in women ages 40-55, is defined by excessive cell proliferation in the milk ducts and lobules. There are an estimated 232,340 new cases in 2013. The key to successful treatment of breast cancer is an accurate diagnosis, which consists of a biopsy following the visualization of abnormalities in breast tissue with mammography. Safer, more accurate devices for lesion localization during biopsy will improve survival rates because current procedures often extract samples that lead to inaccurate results.  Advisors: Mr. Richard Henson, Dr. David Hsiang, Dr. Michelle Khine, Dr. Albert Yee.  UCI Dean's Choice Award.