Tourna Quasi Gut Armor is a variation on the original Quasi Gut, a very arm friendly string loaded with comdfort and power. Like the original, this one is built with over a thousand pliable filaments. However, this one expands upon the original formula with the addition of two very durable co-polyester ribbons. The result is a comfortably firm response with very impressive control for a multifilament. Best suited to players who want a little more precision and durability from their multifilament.