Pre-Stressed for Faster Shoot-in Time. No Peep Rotation. Hand Checked for Quality. Servings Guaranteed not to Slip. No Creep or Stretch. All End Loops are Served. 3-D Loop & Cam Serving: 3-Ply twisted Dyneema for small diameter and ultimate performance. Center Serving:?Spectra/Polyester blended material for ultimate frip & durability. String Material:?Dyneema/Vectran blended material makes for the most stable string available.