STIGA MANTRA M. The STIGA Mantra M is developed with the latest Japanese rubber technology and offers the perfect balance of synthetic and natural rubber. This new rubber mixture creates a tension between the surface and the sponge resulting in an incredible catapult effect. Microscopic air bubbles in the sponge (Oxygen Capsule System) provide great speed with a stable and consistent hit and touch. This rubber is perfect for players who require the highest in rubber quality and performance. The medium sponge used creates a high speed rubber with great hitting power. Mantra M provides tempo and great feeling from mid distance play and gives players the upper hand in aggressive spin on spin rallies.