All our double pulleys mod. PAMIR, ZIP EVO and EVO ZIP HOOK can be equipped with a top protection made of nylon that prevent the user can come into contact with the rotating elements of the pulleys (as required by the norm EN 17109).The protection can be applied and removed easily without the need for any tools.No changes has been made on the bodies of the pulleys, so the protection is applicable to any specimen of PAMIR, ZIP EVO and ZIP EVO HOOK, also produced before 2017.