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;Set with ball end;medium-light 21.8kg/48.12lbs;medium 23.4kg/50.99lbs;forte 23.95kg/52.87lbs;