Single-walled carbon nanotubes (SWNTs) have emerged as a promising new class of electronic materials due to their unique electrical properties. Both metallic and semiconducting SWNTs exhibit electrical characteristics that rival or exceed those of the best available electronic materials. However, manufacturability remains a significant challenge. The review covers the fabrication and electronic properties of devices based on individual SWNTs, highlighting the remarkable electrical properties of these materials. The authors discuss the growth and device fabrication of SWNTs, including the challenges of reproducibility and reliability. They also detail the electrical properties of both metallic and semiconducting SWNTs, noting that metallic tubes can have conductivities and current densities comparable to the best metals, while semiconducting tubes have high mobilities and transconductances. Despite these advancements, the manufacturing issues of SWNT devices are still significant, and controlled, reproducible fabrication remains an unmet goal. The review concludes by discussing the potential applications of SWNT electronics and the ongoing efforts to overcome the manufacturing challenges.Single-walled carbon nanotubes (SWNTs) have emerged as a promising new class of electronic materials due to their unique electrical properties. Both metallic and semiconducting SWNTs exhibit electrical characteristics that rival or exceed those of the best available electronic materials. However, manufacturability remains a significant challenge. The review covers the fabrication and electronic properties of devices based on individual SWNTs, highlighting the remarkable electrical properties of these materials. The authors discuss the growth and device fabrication of SWNTs, including the challenges of reproducibility and reliability. They also detail the electrical properties of both metallic and semiconducting SWNTs, noting that metallic tubes can have conductivities and current densities comparable to the best metals, while semiconducting tubes have high mobilities and transconductances. Despite these advancements, the manufacturing issues of SWNT devices are still significant, and controlled, reproducible fabrication remains an unmet goal. The review concludes by discussing the potential applications of SWNT electronics and the ongoing efforts to overcome the manufacturing challenges.