The Petzl
Zyper is designed as a dynamic cow's tail for use on via ferrata.
The brake is a piece of forged aluminum with one round and one
elongated "teardrop" shaped hole. The 13 mm. cord has
a loop sewn at each end and covered with plastic to protect the
stitching. The distance between the two loops is about 170 cm.
The newer Zypers come with a sewn webbing loop for attaching to the seat maillon. Mine is an older model that does not have this feature; however, I can use a sewn spectra sling to accomplsh the same goal.
