Almana and Almana Sound both have the new revolutionary NC "Nano Composite" technology. NC sponge uses a new mixing technique to create extremely small grains (as small as 50-100 nanometers) during the vulcanization process. Until recently table tennis manufacturers were limited to using large granularity chemicals when creating porous sponge cells. Using techniques from the emerging field of nano technology, STIGA has found a way to control the formation of rubber chemicals at much smaller scales. The result is stronger and tighter bonds that produce maximum dynamic effect. Great for all gluing methods, even the water-based glues.