Cylinder liners are made of high quality 6061 aluminum alloy materials.Our SCBA cylinders have been manufacturing self-contained breathing apparatus and life-support cylinders for firefighters and first-responders for many years. We are the most widely used cylinder brand for these applications, having supplied millions of cylinders. We offer the most comprehensive range of full-wrap carbon composite cylinders. They will provide protection for respiratory system when fire-fighters and rescuers working in the severe circumstances full of smokes, poisonous gases, dusts, or in anoxia conditions.