The string of choice for many players on the tour such as Stan Wawrinka, Raphael Nadal, this durable co-poly string is very, very spin friendly. The slick surface of RPM Blastallows the main strings to slide out of alignment, grab the ball and then snap back to add spin to the shot. While all co-poly monofilaments do this to some extent, our lab tests confirm that RPM Blast is exceptional in this regard. Though RPM Blast offers a slightly softer feel than traditional polyesters, it is by no means the softest co-poly available. It is an ideal choice for big hitters with heavier racquets seeking maximum control, durability, and spin.