This is the XS Scuba 80 Cubic Foot Aluminum Neutral Compact Scuba Tank Features: Shorter than a standard aluminum 80 Nitrox Ready up to 40% (the recreational limits of nitrox) Includes Pro Valve-Standard Yoke and DIN Compatible -0.5 lbs negative" (standard AL 80 is "positive" +3 lbs) buoyant at the end of your dive Take 5 lbs "off" your weight belt compared to a standard AL 80! 3300 PSI 7.25 Inches in Diameter 25.4 Inches in Length Buoyancy Full = -5.6lbs Buoyancy Empty = -0.5lbs "Real Weight" = 33.4lbs COLOR: Brushed No Coat (BNC) - the cylinder is spun underneath a belt sander giving it a shiny "brushed" finish Manufactured by Worthington Cylinders XS Scuba 80 Cubic Foot Aluminum Neutral Compact Scuba Tank."