The new gut like steel string. Cello 
 

Design:	ropecore of extra durable carbon steel  high quality materials modern computer-controlled production traditional Pirastro quality management
Characteristics:	large warm sound  wide range of volume, soft and lively quick response even at pp sensitive left hand feeling excellent pitch stability balanced sound from bottom to top  ideal for both arco and pizzicato
Choices:	three gauges weich, mittel, stark gauge weich:  lower tension, bright sound, low bow pressure gauge stark:  higher tension, powerful sound, more bow pressure; for soloists D-string titanium wound: powerful warm sound  G+C: both silver winding  PIRASTRO® - Flexocor colour code:  ruby spiral on yellow