High-pressure cylinders are specialized containers designed to store gases at high pressures. They are commonly made from strong materials like steel or aluminum to ensure safety and durability. These cylinders are used in various applications, including industrial processes, medical facilities, and recreational activities like scuba diving. The design of high-pressure cylinders includes features such as a valve for gas release and a protective cap to prevent damage. Proper handling and maintenance are crucial to prevent accidents, as the stored gas can be hazardous if the cylinder is damaged or improperly used. Regular inspections help ensure their safe operation.