Horton ST200 Vision String Viper X Premium 8125 with Spectra Halo .030" Red Hand Serving, Red/Black Twist Prestretched 450 Design Spectra Halo .030 Red Hand Serving Red/Black candy cane twist pre-stretched to 450lbs of force forultimate precision. Each of the handcrafted strings feature premium 8125 BCY material with a Spectra Halo .030 center serving.