Yonex Astrox 100 ZZ Badminton Racket 4U_G5 (Kurenai)

The Yonex Astrox 100 ZZ (Kurenai) is a legendary flagship model within the badminton community. Often referred to as a "speedy sledgehammer," this Made in Japan powerhouse is famous for being the choice of elite professionals, including Olympic Champion Viktor Axelsen during his rise to dominance.

The Kurenai edition features a premium matte dark red/crimson finish with intricate holographic decals, making it one of the most visually stunning racquets Yonex has ever produced. In a 4U G5 configuration, it strikes the ultimate balance between heavy attacking power and lightning-fast head speed.

Performance Profile

The Astrox 100 ZZ is distinctly engineered to challenge the idea that head-heavy racquets have to be slow. By combining premium carbon materials with a heavily modified aerodynamic frame, it delivers massive power with surprisingly fast recovery.

1. Explosive, High-Angle Smashes (10/10): The entire frame and shaft incorporate Namd™ graphite, a unique carbon structure that binds nano-materials directly to the graphite fibers. During a full overhead swing, the extra-stiff shaft deforms briefly to store kinetic energy and then snaps back instantly at contact. This whip effect delivers elite-level smash velocity and a sharp downward trajectory.
2. The Hyper Slim Shaft (6.2mm): This is the slimmest shaft Yonex has ever created. It features a completely solid core rather than a traditional hollow interior. This radically reduces air drag—allowing the racquet to slice through the air with blistering speed—while maintaining immense structural strength and low torsion (twisting).
3. Advanced Rotational Generator System: Yonex utilizes a highly refined counter-balance theory, spreading weight across the very tip of the frame, the lightweight built-in T-joint, and the base of the handle via the Energy Boost Cap Plus. Because of this, the heavy head weight becomes "invisible" until you actually wind up for a smash, allowing you to transition between shots seamlessly.
4. Compact Frame with Black Micro Core: The racquet head is slightly downsized (compact) to maximize swing speed. To prevent a small head from feeling unstable, the upper portion is packed with Black Micro Core—a high-density, vibration-dampening material that solidifies the feel of every shot.
5. Modified Isometric Head: To compensate for the compact frame, the inner edges are squared off at the 3, 6, 9, and 12 o'clock positions, expanding the sweet spot by 2.9% for added forgiveness on off-center hits.

Best Suited For

1. Advanced Competitive Tournament Players: The extra-stiff shaft and compact head demand clean hitting technique and fast forearm/wrist snap. Advanced players will find it incredibly rewarding, while beginners or lower-intermediates may find it too demanding.
2. The 4U Sweet Spot (Speed + Power): While the heavier 3U model is a pure singles weapon, the 4U variant is widely considered the absolute sweet spot. It provides enough heavy mass to crush baseline smashes but remains fast enough to handle high-speed doubles defense and mid-court drive duels.
3. Aggressive Players Demanding Ultimate Precision: Perfect for players who play a high-tempo game and want direct, immediate, tactile feedback from the racquet face on precise net drops, cross-court slices, and quick push shots.

Stringing Recommendation: To complement the crisp feel and explosive snapback of the 100 ZZ Kurenai, string it with Yonex Exbolt 65 (for blistering fast repulsion and durability) or BG80 (for a hard, raw, and powerful hitting feel) between 25 to 28 lbs.

Specifications

• Product Tier: PRO / Flagship (Elite Tournament Grade).
• Weight / Grip Size: 4U (Average 83g) / G5 (Standard Slim Grip).
• Balance Point: Head-Heavy.
• Shaft Flexibility: Extra Stiff.
• Frame Material: HM Graphite, Namd™, Tungsten, Black Micro Core, Nanometric.
• Shaft Material: HM Graphite, Namd™ + Hyper Slim Shaft (6.2mm).
• Maximum String Tension: Up to 28 lbs.
• Length: 675 mm (10mm Long Frame).
• Colorway: Kurenai (Matte Deep Red / Crimson with Dark Navy Accents).
• Country of Origin: Made in Japan.