Spring Sponge

SPRING SPONGE X - a new era begins

Following an extensive nine-year research program, Spring Sponge X was developed to generate more power. It response increased by 14%, with impact resilience enhanced by 3% compared to the current Spring Sponge; the result is a big difference in the level of power produced. Spring Sponge X is the key to bringing high performance to Dignics.

14%UP Ease of compression compared to Spring Sponge

Ball bouncing back

3%UP Impact resilience compared to Spring Sponge

The reasons why both flexibility and bounce are required

  • - A high sponge compression flexibility is required to create a high degree of spin combined with stability. Besides, the sponge must have elasticity to generate power.
  • - A softer sponge can easily respond, but the impulse energy created is minimal. Conversely, a harder sponge can enhance elasticity, but it is more difficult to hold the ball as the flexibility is smaller.
  • - Spring Sponge, born in 2008 and applied to Tenergy series, is revolutionary in terms of successfully combining flexibility and high elasticity.
  • - Spring Sponge X, with improvement in both flexibility and high elasticity, is the key to bringing top performance to Dignics.
The compression reaction and elasticity of each sponge
 Compression reactionElasticity
Traditional soft spongeBigSmall
Traditional hard spongeSmallBig
Spring SpongeBigBig

Applying a sponge with 40 degrees hardness to create more power

As a result of pursuing more power, the hardness degree of the adopted sponge is 40°. It is four degrees harder than the Spring Sponge applied to the Tenergy series. However, thanks to the improved flexibility level, a softer feeling is achieved despite the high value of 40°.
In general, the harder the sponge, the heavier the weight of a rubber. Spring Sponge X has the same weight as Spring Sponge applied to Tenergy, even four degrees harder than it.
Therefore, ease of use is secured as the racket does not become too heavy, even if attached to both sides of a blade. A player with less power can also use it without a problem.

10 years in the making, the "Spring Sponge" is the result of intensive research at BUTTERFLY’s own development facilities. A large step towards to this goal was achieved by founding the BUTTERFLY Technical Center in April 2006. Further development has since been intensified and problems can be solved a lot faster.

BUTTERFLY entered a new dimension by combining a new mixture of raw materials with a specific structure of the air bubbles inside the sponge.

The result paved the way for a commercial launch of the "Spring Sponge". The reddish colored sponge named "Tenergy Red" signals BUTTERFLY’s new technology and emphasizes its ambition to lead the table tennis market.

Spring Sponge supports the effect that the rubber holds on to the ball longer than usual. This created an extraordinary ball feeling which cannot be compared to the past rubbers.The premise was: How to increase the impact of the sponge without changing its thickness or texture? Finding the answer took time, but exceeded all expectations. What exactly happens?


traditional sponge

Rubbers with a traditional sponge absorb the energy of an incoming ball. Much like a matt with no feathers. The energy is lost and the ball only receives power only by the player's shot.

spring sponge
The Spring Sponge, however, is thinner and harder - but still elastic. The air compartments contract on impact and then expand again, imparting additional power on the ball. Much like a spring – hence the name, Spring Sponge.

The Spring Sponge technology is used in the following rubbers: