Solid Core Synthetic.
Long lasting syntheic gut designed for most types of players. Excellent durability and tension maintenance.
Stamina was the most successful Wilson string launch ever. The heart of Stamina is Wilson's exclusive Tensilast material which increases durability (up to 25%) without the "stiff" feel common to other durable strings.
Composition: Co-polymer center with 10 Tensilast outer wraps, 10 nylon outer wraps.