VaporTrail told me that they make Bowtech's strings.. but Bowtech makes the cables. The Vaportrail strings that I put on my old '03 Pat look dead up like the string on my '04 pro 40 dually. I've had problems w/ the center serving on both of them... they both slid up on me. I was told that this was due to the TS1 material they're using being soo slick. But I reserved both of them w/ Diamondback serving.. and did it rather tightly.. and I haven't had any issues since.