Tecnifibre · Polyester
Tecnifibre Black Code 4S
Square-shaped co-polyester with four spin edges
Performance ratings
Lab test data
- Stiffness
- 209 lbs/in
Overview
Black Code 4S is Tecnifibre's maximum spin and control polyester with a square shape and four grippy edges. Lab tested stiffness of 209 lb/in makes it quite stiff. "This string's most undeniable characteristic was control" - it enabled playtesters to execute their most powerful strokes without fear of overhitting. The ability to take massive upward cuts combined with the four grippy edges was "a recipe for massive spin." Low powered but provides excellent bite on the ball.
Best for
- Maximum spin seekers
- Advanced players with full swings
- Control-obsessed baseliners
- Those who generate their own power
Not ideal for
- Beginners or intermediates
- Players with arm issues
- Power seekers
- Comfort seekers
Pros
- Maximum spin from square 4-edge design
- Exceptional control - can swing freely
- Great for aggressive topspin
- Good durability
- Predictable response
Cons
- Very stiff (209 lb/in)
- Low power
- Not arm-friendly
- Requires full swings to access benefits
- Should be used in hybrids for most players
Stringer notes
Stiff string - recommend stringing low and using in hybrids. Great as crosses with soft mains.
Break-in period
1-2 hours.
When to replace
Every 12-15 hours when spin drops.
Hybrid setup ideas
- Natural gut or multifilament mains + Black Code 4S crosses
- Should be hybridized for most players
Used by
Various ATP Challenger and college players
Specifications
- Type
- Polyester
- Construction
- Square-shaped co-polyester with four spin edges
- Gauges
- 16, 17, 18
- Colors
- Black
- Set price
- $14–$18
- Reel price
- $150–$180
- Brand
- Tecnifibre (France)
Sources & reviews
Data verified January 2025. Something wrong? Send a correction.
- Specs: Tennis Warehouse
- Pricing: Tennis Warehouse
- Review: Tennis Warehouse Review
- Review: Perfect Tennis Review