D4 special string for classical guitar, developed for professional guitarists;Available in 2 tensions;High durability thanks to the use of a very hard alloy that is also resistant to hand perspiration;In terms of quality and tension, the "Durable" fits harmoniously into the wide range of Hannabach series and can therefore be combined with all sets.;Made in Germany;Tensions:;MT: 6,5kg/14.33lbs ;HT: 7,0kg/15.43bs;