The Wrap Star 5/16" (8.1mm) prusik cords's construction featuring a HMPE core with braided polyester/Technora cover. Construction featuring HMPE core with braided Polyester/Technora cover. Features high heat resistance, a flexible cover allows efficient release of hitches and good knotability. Great abrasion resistance and good grip with firm round shape. TECHNICAL INFORMATION: Material: Cover = Technora/Polyester Core = HMPE. Braid: 24 carrier cover (2 strands per carrier) Cover/Core ratio=55/45 Cover % composition (Technora/Polyester) 8.1mm = 43/57