Yonex introduces 3 new racquets in the RDiS line for 2009, the RDiS 100 (93 & 98 square inch head sizes), and the RDiS 300. The "iS" in RDiS stands for Impact Speed - a snap-back action which stores energy on impact, then releases it with tremendous power and speed. Yonex also utilizes a new graphite construction known as Cup-Stack Carbon Nanotube in its RDiS racquets which helps the frame flex, yet provide quick repulsion for power and a solid feel. The RQiS series sontinues the use of Elastic Ti in the shaft of the racquet. Elastic Ti overcomes the limitations of conventional frame materials. With its powerful rebound effect, a split second after impact and deflection, the Elastic Ti frame snaps back to its original shape with high accuracy and with the full energy of the swing.