The Yonex Tour Super 850 is a multifilament string which means it’s soft and a suitable choice for players wanting comfort. It’s also a great way to soften up a stiff racquet. If you have a tight string pattern should, try the Yonex Tour Super 850 for more playability and feel from their stringbed. Yonex Tour Super 850 Pro has a nylon multifilament core with double nylon wraps. Good tension maintenance. String set strings one racquet.