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Rondo Violoncello

Professional players choose Rondo strings for their exceptionally deep and focused tonal intensity. A fast bow response supports their direct character at any dynamic level, while the strong focus offers a great projection of this rich and complex sound.


RO400 SET, Medium Tension, 4/4 Scale

In Stock

Tension 61.2kg/134.8lb


RO4142 SET, Medium Tension, 4/4 Scale

In Stock

Tension 33.1kg/72.9lb


RO4344 SET, Medium Tension, 4/4 Scale

In Stock

Tension 28.1kg/61.9lb


RO41 Single A-String, Medium Tension, 4/4 Scale

In Stock

Carbon Steel, Multialloy, Tension 18.8kg/41.45lb


RO41XP Single A-String, Medium Tension, 4/4 Scale

In Stock

Carbon Steel, Multialloy, Tension 18.1kg/39.9lb


RO42 Single D-String, Medium Tension, 4/4 Scale

In Stock

Carbon Steel, Multialloy, Tension 14.3kg/31.53lb


RO43 Single G-String, Medium Tension, 4/4 Scale

In Stock

Spiralcore, Tungsten/Chrome, Tension 14.3kg/31.53lb


RO44 Single C-String, Medium Tension, 4/4 Scale

In Stock

Spiralcore, Tungsten/Chrome, Tension 13.8kg/30.42lb


Set details

The RONDO set RO400 is appreciated by professional musicians due to its intense tonal depth and accurate bow response at a vast range of dynamic levels. The particular essence of the set RO400 is its innovative synthesis of a barrel-chested, velvet-like sound with the greatest possible “density” and a crystal-clear focus. By merging these qualities to a deep singing sound with a mature vocal character, it creates the widest range of sonic variations, a powerful presence at all dynamic levels and a new playing experience. The set impresses with its maximum resistance to bow pressure and immediate bow response at various bowing speeds, bow pressures and contact points. These strings tonally enrich both old and modern instruments with their intense depth, brilliant contour and sweetness – sound qualities mostly associated with “old Italian” instruments.

Single string details

Single A-String
Single G-String
Single D-String
Single C-String

Mix and match

The set RO400 is perfectly balanced. Mixing it with different single strings can change its original character, which can be used to optimize its performance depending on your and your instrument’s needs.

With other Thomastik-Infeld products:

When combined with three lower Rondo strings, the A-string VES41 adopts some of their qualities and sounds darker than in the full Versum Solo set. Compared to the A-string RO41, VES41 works on a lower tension level with a different string design, offering a broader character on most instruments. Especially when the cello’s A-string leans towards a bright and narrow tendency, using the combination with VES41 can be a great help.

To add more focus to the high register, we recommend using a combination of Versum Solo’s D-string VES42 and A-string VES41 with Rondo’s G-string RO43 and C-string RO44. Both the A+D as well as the G+C strings are available as twin sets (VES4142, RO4344). In this combination, more focus is added to the generally broader character of the Versum Solo’s A+D strings while making Rondo’s RO43 and RO44 slightly smoother and darker. Matching these four strings offers a resonant and warm sound, which allows especially the top strings to breathe and shine.

The tungsten-wound Spirocore C-string S33 is a globally respected reference string choice on the cello. Using this string in combination with the other three Rondo strings will give the set a more resonating and sparkling tone. The very powerful and brilliant C-string S33 itself becomes a bit darker while keeping its exceptionally crisp character. The upper strings, especially the A-string RO41, become inspired by S33 so as to increase their overtone spectrum and their sensitivity to bowing speed.

Technical details

Rondo Violoncello 4/4
NO. Tension Core material Outer material TAILPIECE END KG LB PEG END
RO41 a la I medium Carbon Steel Multialloy
Brass Ball End
18.8 41.45
RO41XP a la I medium Carbon Steel Multialloy
18.1 39.9
RO42 d re II medium Carbon Steel Multialloy
Copper Ball End
14.3 31.53
RO43 G Sol III medium Spiralcore Tungsten/Chrome
Nickel Crimp ball end
14.3 31.53
RO44 C Do IV medium Spiralcore Tungsten/Chrome
Brass Crimp ball end
13.8 30.42
SET NR. Included in set Tension KG LB
RO400 RO41, RO42, RO43, RO44 medium 61.2 134.8
RO4142 RO41, RO42 medium 33.1 72.9
RO4344 RO43, RO44 medium 28.1 61.9


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