Traditional reeds (blue box) are available in strengths 1 to 5.The most widely played reeds in the professional world, with a superiority proven over many years, these reeds suit all styles of music.The principal acoustic qualities are:- Excellent response in all registers, even allowing a pianissimo attack of the highest notes.- Flexibility allowing the legato or staccato execution of large intervals.- A richness of tone which give body and brilliance to the sound.- Thickness at the tip: 0.09 mm (0.0035 inch)- Thickness at the heel: 2.8 mm