Butterfly Tenergy 64 vs Yasaka Rakza Z: Which Should You Buy?

UltraSpin comparison · 2026-06-07 · rubber

Butterfly Tenergy 64Yasaka Rakza Z
Our rating8.6/108.6/10
best_sideboth wings, but especially the backhand and for speed-first attackersforehand
controlmedium-highhigh
speedvery highmedium
spinhigh but the lowest of the Tenergy lineextreme
sponge_hardnessapproximately 36 degrees on the Butterfly scale (around 48 degrees ESN, plays nearer 45)50 degrees (medium-hard; Extra Hard version around 57 degrees)
typespring sponge high tension tensor, inverted topsheethybrid tacky tensor
weight_uncut_gapproximately 70 (around 47 g cut at 2.1 mm)72

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These rubbers suit very different playing styles. Tenergy 64 is the fastest Tenergy, spin-insensitive and easy to block and counter with, plus light and versatile on either wing. Its low throw and unforgiving passive receive ask for an angle adjustment.

The Yasaka Rakza Z is a tacky hybrid built for extreme, low-slip spin on loops, backspin openings and serves, with a surprisingly high control and long dwell time for a hard rubber, plus a strong linear kick when you commit fully. It is heavy and can cause arm fatigue, has a high throw, and is weak at less than full power or when out of position.

Go with Tenergy 64 if you want fast, spin-insensitive, versatile play and easy blocking. Go with the Rakza Z if you are a proactive forehand looper who wants to pressure opponents with heavy spin and placement and is happy to swing fully, or want a cheaper tacky hybrid in the style of Dignics 09C or boosted Hurricane 3.

FAQ

Which rubber produces more spin?

The Yasaka Rakza Z. Its tacky topsheet delivers exceptional, low-slip spin rated as extreme, while Tenergy 64 has the lowest spin of the Tenergy line.

Which is better for blocking and flat hitting?

Tenergy 64. It is spin-insensitive with reliable blocks, whereas the Rakza Z is mediocre at flat hitting, driving and is slow at less than full power.

Is the Rakza Z heavy?

Yes. It is a heavy rubber that can cause arm or wrist fatigue, especially on carbon blades, while Tenergy 64 is light for an offensive rubber.