Made with 7x19 Stainless steel aircraft cable. 
Swages are zinc plated copper for max strength. 
Available in three sizes. 1/16”, 3/32” & 1/8”

These are great for climbing bolt and rivet ladders on lead,  keep one on each aider biner, once you move past a rivet or bolt leave a butterfly hanger behind, only tighten it hand tight.  They will be easier for your follower to clean and will last much longer and ‘pigtail’ much less!