This is the Oceanic Alpha 10 Octo Scuba Diving Octopus Features: The best price-to-performance ratio in its class Designed to perform to the U.S. Navy&';s Class A standards Inexpensive to maintain Available with Miflex Hose Pneumatically balanced demand valve Integrated Purge Button Orthodontic Mouthpiece Nitrox Compatibility - Standard to 40% Weight (without hose) - 6 ounces Dimensions (front profile) - 2.9 inches Simple, dependable and economical, Alpha 10 Octo provides effortless breathing in a compact design that&';s extremely tough, yet easy to maintain.