The Astro retains many of the features that run through the Helium concept, creating a ‘biner that’s exceptionally strong, compact and lightweight. Importantly, the Astro retains a practical size and an overriding ability to be used in all circumstances, which is an essential part of karabiner design that is sometimes forgotten in the race to shed weight. Features: Superlight, ‘I beam’ back, Hot forged, Tech Wire gate.