TSP Blades with „intelligent“ core. The heart of the patented TSP Balsa-Series is the middle layer. The combination of the elastic fibreglass layers with the vertical wooden fibres leads to a round and especially large hitting area (sweet spot). The result is an extremely precise bounce of the ball, free of vibration and an amazingly high rate of control at all variations. The most important feature of the Balsa System is, that the speed of the blade can be varied by adjusting the thickness of the Balsa core.