Cello strings are made from gut, steel & synthetic cores. Commonly used A & D strings tend to be steel-core strings, such as those offered by Jargar & Larsen.  Popular lower string options from Thomastik, Larsen & Pirastro incorporate tungsten windings, which provide quick bow response with power and tonal clarity. There are many other strings worthy of consideration, including those from D'addario, Warchal, Prim, Corelli,and Piatti.
