Double covered nylon shock cord has a multistrand live rubber core protected with an abrasion resistant braided nylon fiber jacket. It is rot resistant with long-life stretch and elasticity TO ASSEMBLE: Insert cord through small end of the terminal fastener. Tie knot and crimp locking ring behind knot. Trim end and pull knot inside terminal. Ends of cord may be dipped in rubber cement or lacquer to seal ends. MIL-C-5651D – Type 1. (Fasteners and rings sold separately) Sold by the foot.