CNC vs RTM vs Handcrafted Surfboard Fins: Which is Best?

When it comes to surfboard fins, the manufacturing process dramatically affects performance, durability, and cost. As a manufacturer specializing in all three methods, PROMAX breaks down the key differences to help you choose the right fins for your brand or personal setup.

CNC Machine Fins

CNC (Computer Numerical Control) machining starts with solid fiberglass panels containing 50+ layers of material. A computer-controlled router precisely shapes each fin to exact specifications.

Pros:

  • Extremely consistent — every fin is identical
  • Excellent durability and impact resistance
  • Smooth flex patterns ideal for everyday surfing
  • Cost-effective for medium to large production runs

Best for: All-around surfing, surf schools, brands needing consistent quality at scale.

RTM Molded Fins

RTM (Resin Transfer Molding) uses a closed-mold process where resin is injected into a mold containing fiberglass or carbon fiber. Many RTM fins feature honeycomb core construction.

Pros:

  • Up to 30% lighter than solid fiberglass CNC fins
  • Superior strength-to-weight ratio
  • Excellent for performance and competitive surfing
  • Great consistency across large batches

Best for: Performance surfers, competitive riders, brands targeting the high-end market.

Handcrafted Fins

Handcrafted fins are shaped, sanded, and finished by skilled artisans. Each fin has unique character and craftsmanship.

Pros:

  • Unique aesthetic and artisan appeal
  • Highly customizable for specialty orders
  • Traditional craftsmanship valued by collectors
  • Flexible production for small batches and prototypes

Best for: Boutique brands, custom orders, traditional surfboard enthusiasts.

Which Should You Choose?

  • For volume and consistency → CNC machined fins
  • For lightweight performance → RTM molded fins
  • For artisan quality → Handcrafted fins

At PROMAX, we manufacture all three types with full OEM/ODM capabilities. Whether you need 50 pairs or 5,000, we can match the right process to your brand's needs. Contact us for samples and pricing.

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