The Zoom Snorkel Series has been developed, by Omer's technicians, specifically for Spear Fishing and Free Diving. The shape of the Silicone Mouthpiece and the Air Tube has been Ergonomically Designed to follow the Profile of the Spear Fisherman's Face, to greatly reduce its Visibility during the Dive. The Internal Diameter of the Tube is 20 mm, a Specific Dimension to Optimize the Air Flow Rate.