D'Addario Helicore Violin set: 

Helicore violin strings are crafted with a multi-stranded steel core, resulting in optimal playability while producing a clear, warm tone. The smaller string diameter provides quick bow response. Premium quality materials combined with skilled workmanship produces strings known for excellent pitch stability and longevity.

Set Includes:

• Helicore Violin E - Aluminum Wound over Steel, Removable Ball End
• Helicore Violin A - Aluminum/Steel
• Helicore Violin D - Aluminum/Steel
• Helicore Violin G - Nickel/Steel