The Nitro String Loop is premium grade loop material (.085" / 2.17mm Dia) that will not disappoint the most discriminating bow-techs. Low Stretch, Premium Quality Braided Material for Secure, Consistent Hold Ends Burn Easily for Clean Installation Available in Pre-Cut and Bulk Spools Eliminate Serving Wear Due to Release Aid Extra Stiff Material to Maintain Shape Diameter: .085" / 2.17mm Many Colors to Choose From.