This document provides information about coronary guidewires. It discusses the history of angioplasty and development of over-the-wire balloon systems. It describes the key components and characteristics of guidewires, including the core, tip, coils, covers, and coatings. It explains properties like torque control, trackability, steerability, and flexibility. It also covers classifications of guidewires based on tip flexibility, device support, coating, and clinical scenario. Examples of commonly used guidewires are provided.