Tecnifibre Black Code 4S
Square-shaped co-polyester with four spin edges
Junior Player Guide
For ParentsRecommended Level
Tension for Juniors
44-48 lbs for juniors. String low due to stiffness.
Gauge Recommendation
17 (1.25mm) for maximum spin.
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
Specifications
Used By
Hybrid Setup Ideas
- Natural gut or multifilament mains + Black Code 4S crosses
- Should be hybridized 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.
Similar Strings
Sources
Data verified January 2025
- Specs: Tennis Warehouse
- Pricing: Tennis Warehouse
- Review: Tennis Warehouse Review
- Review: Perfect Tennis Review
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