Tecnifibre ATP Razor Code 16 is a firm and durable co-poly that rewards full cuts with pinpoint accuracy.  Our TW playtesters found this one to provide remarkable precision and very easy access to spin. Unlike traditional polyester strings, ATP Razor Code is built with special additives to improve the feel. In addition to being a great option for the advanced player, this one has enough all-around playability for the strong intermediate who wants to make the transition to a firmer control string.