503CR: The Cristal trebles are produced from a new and improved nylon. The amount of crystallinity of the string is optimized and there is a perfect link between the molecules. This string is as transparent as crystal and the intonation is perfectly true. This nylon is not rectified in order to keep a smooth surface on it. A surface treatment and a control driven by a computer using laser beam and photoelectric cells permit a real precision and regularity of the gauge.