This set contains: E-Tinned carbon steel core, no winding, Ball End, A-Synthetic/Aluminium, D-Synthetic/Silver, G-Synthetic/Silver.
Kaplan Vivo strings have an advanced synthetic core, which produces a rich, powerful tone. Vivo strings deliver brilliance, clarity and a robust feel.

Features:

• Advanced Synthetic core produces a rich, powerful tone. 
• Delivers brilliance, clarity and a robust feel for darker instruments.
• Short break-in time. 
• Excellent bow response. 
• Superb playability. 
• Recommended for professional players. 
• Packaged in uniquely-designed sealed pouches providing unparalleled protection from the elements that cause corrosion.