This shock cork consists of multi strand rubber filament core enveloped in a protective 16 braid polyester sheath, resulting in an elastic cord with consistent stretch, strength and recovery which can be repeatedly stretched to double its retracted length. Frequently used with tarpaulins & soft cover tie-downs for trailers, roof-racks, bike-racks, boat covers, and replacement cord for ute covers. 6mm x 10m Hank.