Butterfly Dignics 09C vs Nittaku Fastarc S-1: Which Should You Buy?

UltraSpin comparison · 2026-06-12 · rubber

Butterfly Dignics 09CNittaku Fastarc S-1
Our rating8.7/107.9/10
best_sideforehandforehand or backhand
controlmedium-high70
speedhigh (when looping with full swing)97
spinextreme96
sponge_hardness44 degrees (Butterfly scale; plays around 50-52 ESN)35 degrees
typehybrid tacky tensor (Spring Sponge X)inverted
weight_uncut_g70around 41-43g

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Dignics 09C and Fastarc S-1 occupy opposite ends of the performance-demand spectrum. Dignics is heavy (70g), extremely spinny, and tailored for committed forehand attackers who embrace high throw angles and full-swing requirements. Fastarc S-1 is one of the lightest tensors available (under 43g), trades peak spin for speed and accessibility, and works naturally on backhand and forehand. S-1 emphasizes genuine tensor pace over catapult, making it ideal for intermediate players bridging beginner rubbers to serious offense. Dignics commands faster, more active arm speed and penalizes technique lapses; S-1 forges a gentler path upward while maintaining solid control and blocking stability.

FAQ

Which is better for backhand?

S-1 is purpose-built for backhand and forehand. Dignics is forehand-focused; users report it hurts backhand flicks and play.

Which is lighter in hand?

S-1 weighs around 41-43g uncut, making it feather-light. Dignics at 70g feels substantially heavier.

Which has more spin ceiling?

Dignics rates extreme spin; S-1 is more moderate and speed-focused. Dignics dominates spin output.

Who should choose S-1?

Intermediate all-round attackers upgrading from beginner rubbers, or anyone prioritizing lightweight, forgiving speed over peak spin.

What if I want the hardest backhand?

Neither excels at backhand power. S-1 is your better bet on backhand; Dignics suits dedicated forehand setups.