A climbing rope is made to carry decent weight. Converted to a lanyard as here, it will still prove "unbreakable" over the years, especially as in this material combination with tarpaulin and leather - in a wide loop of tarpaulin, the shackle that holds the keys is firmly sewn in. To loosen this and thread the keys on, the manufacturer recommends, you should use the leverage of a fork (yes, a chopstick) to help. The lanyard is handmade in Hamburg.