What is the Cetma Shark speargun?
The Cetma Shark is an aluminium speargun designed to combine high performance, precision and versatility at an affordable price level. Its defining feature is the unique 3-in-1 muzzle, which allows the same speargun to be configured in single band, double band or Vela setup simply by changing the rubber system, without replacing the muzzle or any other component. Thanks to this innovative solution, the Cetma Shark represents a true reference point in the aluminium speargun market.
Why the Cetma Shark Vela won the 2025 Best Choice Award
In its Vela configuration, the Cetma Shark has already demonstrated outstanding performance. More than raw power, it is the ease of use, exceptional shot precision, and high-quality design and materials that led the Apnea Passion International Team to award it the 2025 Best Choice as the best aluminium Vela speargun on the market. With a list price of 407 € in the 72 cm version, combined with an elliptical aluminium barrel, the Shark Vela offers an almost unbeatable performance-to-price ratio.
Why analyze the double rubber version?
The double rubber setup represents another key configuration of the Cetma Shark. Thanks to the modular muzzle, switching from Vela to double bands—or back to single bands—requires only a quick and simple rubber change, without modifying any other part of the speargun. This level of versatility is unique on the market and confirms the Shark by Cetma Composites as a winning design.
Double rubber muzzle: material and dimensions
The muzzle of the Cetma Shark features an oval cross section, perfectly matching the aluminium barrel. The main body measures 45 mm in width and 26 mm in height. Including the upper and lower wings for monofilament passage, the overall dimensions become 59 mm in width and 33 mm in height. This geometry is designed to maximize rigidity while maintaining a clean line of aim. The muzzle is manufactured in glass-loaded nylon, chosen for its high mechanical strength, excellent rigidity and resistance to humidity and long-term deformation, ensuring consistent performance over time and contributing directly to shot precision.
Technical advantages of the double band setup
In the double elastic band configuration, with four straight bands arranged in two pairs, the Cetma Shark allows all bands to run perfectly parallel to the shaft. This is a key advantage over traditional circular band systems, as the pulling force is fully aligned with the shaft axis. As a result, 100% of the elastic energy is transferred directly into forward propulsion, with no lateral force components. The outcome is maximum efficiency and superior precision.
Perfect clearance of the line of aim
The special 3-in-1 muzzle design ensures a completely unobstructed line of sight. The bands remain parallel to the shaft, improving aiming intuitiveness, visual reference and shot consistency. This aspect is particularly important in real spearfishing conditions, where instinctive aiming plays a decisive role.
Effective recoil control
Recoil management is another strong point of the Cetma Shark. The muzzle uses two pulleys to which one pair of bands is connected, minimizing the impact generated by band overturning immediately after the shot. This reduces destabilization before the shaft exits the barrel and improves overall precision. In addition, the general design of the Shark is derived from Cetma Composites’ high-end carbon spearguns such as the Canova, Arrow and Uragano. Any residual recoil acts perfectly along the speargun axis, pushing the hand slightly backward without lifting or lowering the muzzle.
Power setup and band configuration
In the double band configuration, the Cetma Shark is equipped with four 14 mm Progressive Black rubbers. In the 72 cm version, the bands connected to the pulleys are 19 cm long, while those connected to the pass-through holes measure 17 cm. This setup is easy to load, well balanced and not extreme. The generated power is solid and well controlled, with room for further tuning by shortening the bands. Additional tests with more aggressive setups are planned in the coming weeks.
Conclusion
The Cetma Shark double rubber configuration confirms the speargun as one of the most intelligent and versatile aluminium solutions currently available. Precision, recoil control, modularity and price positioning combine into a product that sets a new benchmark in its category.
