Thomastik-Infeld 
採用高活性鋼與防鏽黃銅塗層獨家工法製作， 能產生更響亮和強硬的音質。低音的弦線用上較粗的弦徑，因此能中低音域會更肥厚有力。 延音和音量相對會比INFELD系列更長，適合harmonics, tapping 等彈奏技巧。
適合用於錄音。

弦徑:
RP109 - .009 .011 .017 .026 .037 .046
RP110 - .010 .013 .018 .028 .042 .050
RP111 - .011 .015 .019 .032 .045 .053
 
Round wound Magnecore alloy on a flexible hexcore for a bright aggressive tone, extra long sustain and reduced playing effort. With heavier gauges towards the basses, for players who like a “fatter” tone stronger in the lower mids and bottom end.
Designed to enhance harmonics and percussive effects like tapping. High output plus a boost in the high frequencies drive effects to their limits. POWER-BRIGHTS love distortion!
Suitable for recording session.
 
Gauge:
RP109 - .009 .011 .017 .026 .037 .046
RP110 - .010 .013 .018 .028 .042 .050
RP111 - .011 .015 .019 .032 .045 .053