This book focuses on mechanical and electric designing, body shape sensing and tip motion control of various types of light slender robots based on tendon-sheath transmission. From the theoretical concise figures and practical examples of tendon-sheath transmitted mechanisms illustrated succinctly and clearly with 3D color drawings in this book, the proposed readers, including the researchers and students, might get inspirations in their own robotic system design or just following this book to build their own tendon-sheath actuated light slender robotic systems.