Hannabach E815 Is The Mt-Black Set Classical Guitar Strings. â– Gradually Extended In Accordance With Hannabach (Hanabahha) Heavy Sound And Balance The String Of German-Made Unique Is Yuku Use, The String You'Ve Completely Completely Extends Will Get Lost Tension In The Sound. Generally, Short Life Of The Bass Strings Than Treble Strings, In The Normal Practice Would Be The Deterioration Of The Sound In About 2 3 Weeks Is Felt. Early String Exchange Trick Is To Produce A Good Sound. It Becomes Hannabach (Hanabahha) Silver Special Series (Standard Strings Are Being Used All Over The World) Black Set (Medium Tension) 1 String To 6-String Of The Pack.