CST COMPETITION

Choose the hardness according to your body weight and preferred fin stiffness.

1 · up to 75 kg (165 lbs)
2 · 75–85 kg (165–187 lbs)
3 · 85–95 kg (187–209 lbs)
4 · 95–105 kg (209–231 lbs)
5 · 105–115 kg (231–254 lbs)

Hardness selection: Our hardness recommendations are based on the diver’s body weight, assuming approximately 4–6 kg (9–13 lbs) of lead is used for dives beyond 15–20 m. Individual preferences, diving technique and physical strength may also influence the ideal hardness.

If you are between two options or are unsure which hardness is right for you, contact us for a recommendation.

Mares Razor
Omer Stingray
Pathos

Custom foot pocket options are also available on request, including C4, Cressi, Seac, Spetton and Picasso.

Total blade length — by foot pocket
Mares Razor · 782 mm
Omer Stingray · 784 mm
Pathos · 760 mm

Standard blade dimensions
Bending length · 637 mm
Blade width · 200 mm
Blade angle · 22°

Bending curve: C-shaped tendency

100% high-tensile carbon fiber combined with a specially formulated epoxy system.

BlackTech uses VRTM manufacturing with high temperature and high vacuum processing to achieve a highly consistent laminate with 0% void level.

The manufacturing environment is controlled for temperature and humidity. Each carbon blade undergoes two 14-hour post-curing cycles controlled by PLC technology with temperature deviation of less than ±0.1°C.

The result is a precisely manufactured carbon blade with consistent flex, high structural integrity and long-term performance.

CST Competition features red water rails designed to improve water flow during blade flexing, helping to reduce turbulence and improve stability and handling.

The blades feature BlackTech's signature mirror finish on the front and back surfaces.

CST Competition is designed for serious spearfishers looking for a high-performance all-round carbon fin.

It is particularly suited to:

• Deep spearfishing and powerful ascents
• Long shallow-water hunting sessions
• Divers who want strong propulsion with progressive flex
• Experienced spearfishers who demand long-term performance

CST Competition carbon blades come with a 3-year written warranty.

The warranty applies according to BlackTech's official warranty terms.

BlackTech blades are produced upon order.

Typical production time is 25–45 business days, depending on current production workload.

Made in EU.

Which hardness should I choose?

Choose the hardness according to your body weight and preferred stiffness. If you are between two options or are unsure, contact us for a recommendation.

Which foot pockets are available?

CST Competition is available with Mares Razor, Omer Stingray and Pathos foot pockets. Other foot pockets can be prepared on request.

Can CST Competition be used for shallow-water spearfishing?

Yes. CST Competition is an all-round high-performance spearfishing fin and can be used for both deep dives and long shallow-water sessions.

How long does production take?

Typical production time is 25–45 business days, depending on current workload.

Is CST Competition covered by a warranty?

Yes. CST Competition comes with a 3-year written warranty according to BlackTech's warranty terms.