Larsen strings are steel core, available in 3 tensions in 4/4 size.  Fractional for 3/4-1/8 size cellos are available in medium tension only, and this is a great option for high-quality strings.   Brand is identifiable by yellow thread with black spiral at the tailpiece end.  Soft tension is blue at the peg end, medium is red, strong is yellow.   Note the color of the metal ball will identify string pitch.  *These are very popular strings with a high success rate on many cellos

 4/4 size                                                                                                  3/4, 1/2, 1/4, 1/8 size

$52.00   E     aluminum/steel              Brass color ball (med only)                     n/a

$42.82   A     chrome/steel                 Brass color ball                                  $28.00   

$56.10   D     chrome/steel                 Chrome color ball                              $39.00 

$80.04   G     tungsten/steel               Copper color ball                              $47.00      wire core

$98.92   C     tungsten/steel               Black ball                                         $54.00      wire core