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;A Stabilon-Nylon/Aluminium wound;medium-light 5.0kg/11.04lbs;medium 5.3kg/11.7bs;forte 5.6kg/12.36lbs;