If you are looking for a softer shaped poly then this has to be on your short list. The Head Sonic Pro Edge 16 Tennis String Set is made from uniquely refined and ultra playable co-polymer polyester with a soft molecular construction. Softer polyester strings a ideal for hard hitting juniors, or any player with previous arm injuries, that seek durability and performance but don’t want to potentially cause injury from a harder material. The string offers easier depth than most polyesters and thanks to its pentagonal shape, it also gives players superior control, touch, and tremendous spin. This exceptionally durable string offers excellent response and playability that make a real difference. Made for the aggressive baseliners who want perfect control, pace, and spin without sacrificing touch or feel.