Cello inexpensive wood that has been blackened or "ebonized" to look like ebony, which is much harder and more expensive. Ebonised parts such as tuning pegs may crack or split, and the black surface of the fingerboard will eventually wear down to reveal the lighter wood underneath. Historically, cello strings had cores made out of catgut, which, despite its name is made from sheep or goat intestines which are dried out. Most modern strings used in the 2010s are wound with metallic materials like aluminum, titanium and chromium. Cellists may mix different types of strings on their instruments. The pitches of
Kingri (string instrument) inserted into the fingerboard with three pegs. The strings on the bow are made by using three tufts of horse hair or Goongaru. The strings on the instrument were originally made of animal gut, but modern day Indian gypsies typically use low quality steel strings instead, resulting in more vibrato and lending the instrument a sound similar to the violin. Sri Lankan composer Dinesh Subasinghe used the kingri on the album Rawan Nada as well as for performing folk music. In 2007, Subasinghe made some modifications to the instrument and discovered it to be another close version of the Ravanstron