The KOKUTAKU Blutenkirsche 868 Blue Sponge is a professionally engineered offensive rubber specifically optimized for the 40+ new material ball era. Featuring a signature high-elasticity Blue Sponge, this rubber addresses the unique physics of poly balls by enhancing both the “encapsulation” (ball-holding) and the structural support force of the surface. Its specialized half-sticky top-sheet provides a perfect balance—offering enough tackiness for devastating spin on serves and loops, while maintaining the crisp speed of a tensioned rubber. With a Medium+ hardness and 2.15mm precision thickness, the 868 Blue Sponge empowers athletes to execute complex technical strokes with ease and superior stability.

The hallmark of the KOKUTAKU 868 Blue Sponge is its “Structural Integrity.” It offers a specialized performance profile designed for elite competitive mastery:
* **High-Elasticity Blue Sponge Formula:** The vibrant blue sponge is specifically treated to offer better elasticity than traditional high-density sponges. This ensures that the 40+ ball leaves the racket with higher velocity, effectively compensating for the natural speed loss of larger balls.
* **Optimized Half-Sticky Top-Sheet:** The “Blutenkirsche” (Cherry Blossom) surface utilizes a half-sticky formulation. This hybrid approach provides the massive spin potential of a Chinese tacky rubber during brush-loops, but allows for the explosive “flat-hit” speed typical of Japanese-style rubbers.
* **Superior Support Force:** The reinforced structural support within the rubber ensures it does not “bottom out” during heavy counter-looping exchanges. This gives players the confidence to go for maximum power at mid-to-far distances.
* **Exceptional Ball-Holding (Encapsulation):** The optimized pimple geometry under the top-sheet allows the ball to “sink” deeper into the rubber upon impact. This increased contact time (dwell time) leads to higher spin coefficients and improved directional accuracy.
* **Professional Medium+ Calibration:** With a 2.15mm thickness and Medium+ hardness, this rubber provides a solid, crisp feedback that helps athletes refine their technique and dominate high-intensity rallies.

[Image Concept: Close-up of the professional Blue Sponge pores and the iconic KOKUTAKU Blutenkirsche “Cherry Blossom” stamp on the high-tension top-sheet]

Whether you are looking for a forehand rubber with a devastating “second bounce” or a backhand option with elite blocking stability, the KOKUTAKU 868 Blue Sponge provides the technical integrity and “responsive” power required for victory.

• Characteristic: Half-sticky

• Hardness: Medium+

• Thickness: 2.15