Thomastik Infeld THRO-41-XP cello string A-1 4/4, carbon steel core, multialloy woundThomastik Infeld THRO 41 XP cello string A 1 4 4, carbon steel core, multialloy wound The Thomastik Infeld RONDO Experience NO. RO41XP is a very vibrant string and offers an exceptional amount of sparkle and overtone richness compared to the regular NO. RO41. It reacts even faster to bowing impulses from the right hand and at the same time produces a clear, distinct sound with minimum effort from the left hand. The string has 700g less string tension,