NEW CRYSTAL: New STABILON fibre for the core, new computer-based technology and even more accurate automated checks during manufacturing have further enhanced the characteristics of the popular CRYSTAL range. ;Larger overtones, fast and more accurate response;Quality sound projection from pianissimo to fortissimo;E Steel with ball end;Medium-light 8.0kg/17.66lbs;Medium 8.6kg/18.98bs;fStrong 8.6kg/18.98lbs;