It’s still one of the “softest” polyesters out there, Head Sonic Pro 16g has proven to be a go-to choice for those who want the polyester characteristics minus the harshness. It has the stiffness of a nylon “synthetic gut” (most polyesters are MUCH stiffer) and maintains tension and playability quite well throughout it’s lifespan (polyesters are famous for losing tension and playability VERY quickly).

Many of newest generations of polyesters have a “plastic” and “dead” feeling. But not Head Sonic Pro. It’s a polyester that has amazing feel and response. I also like that it’s a 16g (1.30mm). I know the current trend is to string with extremely thin polyesters (18g or 1.20mm and thinner) at the moment but for those who want a durable and hefty string, Head Sonic Pro 16g remains one of my favorite.