Natural Gut vs Synthetic Tennis Strings

Natural Gut

Made from cow intestine. Premium price ($40-$80 per set). Pros: the gold standard for feel, power, comfort; outstanding tension maintenance; gentlest on tennis elbow. Cons: expensive, breaks faster than poly, sensitive to humidity (Australian tropics are tough on it).

Synthetic Gut

Nylon-based mid-range string ($10-$25 per set). Pros: affordable, decent feel, good all-rounder, reliable bounce. Cons: mediocre tension hold, lacks the spin response of poly, lacks the comfort of natural gut. The default beginner string for good reason.

Polyester (Co-poly)

Polyester or co-polyester ($15-$35 per set). Pros: outstanding spin response, durable (lasts 4x longer than gut for a heavy hitter), holds tension under big swings. Cons: stiff, transmits more shock (raises tennis elbow risk), needs lower tension and more frequent restringing despite durability.

Hybrid Stringing

Many advanced players hybrid: poly mains + natural gut crosses (the Federer setup). Best of both -- durability + comfort. Expensive ($50-$100 per restring) but transformative for serious players.

Tension Considerations

Natural gut: 55-62 lbs typical. Synthetic gut: 55-62 lbs. Polyester: 45-55 lbs (lower tension because it's stiffer). See our string tension guide.

Cost-per-Hour Math

Polyester: $25 strings, breaks every 25 hours = $1/hr. Synthetic gut: $15 strings, breaks every 15 hours = $1/hr. Natural gut: $60 strings, breaks every 12 hours = $5/hr. Natural gut is 5x more expensive -- but for tennis-elbow sufferers, the comfort is worth it.

The Verdict

Beginner: synthetic gut. Intermediate big hitter: polyester (lowered tension). Advanced player or tennis elbow: hybrid or full natural gut. Junior: synthetic gut at lower tension (50-54 lbs).

Related

Tennis String Guide | String Tension Guide | Tennis Elbow Prevention.