Class II (core-dependent) double braids are made in whole or part from any of the following high modulus fibers: Dyneema® , Vectran® , Technora® , and Zylon® . The eye splice is used to place a permanent loop in the end of a rope, generally for attachment purposes to a fixed point. An eye is also used to form the rope around a thimble, which is used to protect the rope, especially when it is to be attached to a shackle, chain, or wire rope.