728 Medium - Full Set Hannabach HAN728MT Class Guitar Strings CUSTOM-MADE 6 PC SET MT (E1, H2. G3, D4, A5, E6) 6 different tension levels are available: Red Label – SHTSuperHighTension Blue Label – HT High Tension diff. Labels – MHT Medium High Tension Black Labels – MT MediumTension Green Labels – LT LowTension Yellow Labels – SLT SuperLowTension Since 1869 HANNABACH has been making the finest quality strings for the most demanding musicians. Today HANNABACH offers a broad range of styles and tensions. From octave guitar to double bass and everything in between. The right string for every style and need.