What is a ball end string?
Update: Feb 27, 2016 - Removable Ball-End Strings are now a very popular type of Violin E string and Viola A string. These strings have a ball end that can be removed to reveal a loop-end. Not all ball end strings are removable! "
What does ball end mean?
The ball end makes it easier to slide the key into the receiving slot. It allows you to reach at an offset 30 degree angle so that you can feel your way to the needed position much faster - great for blind or difficult areas to reach or if the bolt or screw is close to an obstruction on one side.
What are high end violin strings made of?
Modern violin strings
The core can be made of gut, steel, or synthetic polymers. Not only do the types of metals used in the core affect the sound quality, but whether the core is made of a solid metal, stranded metal, or synthetic polymers also makes a difference.