The Viper 640 Jib Tensioning system has two parts -- this primary length made with 1/8 in Samson Amsteel Blue that connects with the tensioning blocks below decks takes the majority of the tensioning load. This length has an eye splice in both ends.
The second length, V640170, is the control length, which is what you'll use to add/ease tension on the jib halyard -- these are made with 5/32 in Swiftcord for ease of handling. This length has end whips on both ends for durability.
Samson Amsteel Blue.This high performance Dyneema SK-75 & Polypropylene single braid line has minimal stretch and zero water absorption.