Very lightweight Twin Gate patented system double wiregate hot forged karabiner with an S wire design with key lock effect.
This is effectively a full strength locking karabiner at only 39g (this is lighter than a DMM Phantom!) and we can see it being very useful for winter climbing where screwgate karbiners are liable to freeze up.
The twin gate system initially seems a bit faffy but becomes much easier with use once you realise that you only need to open one gate and simply clip the second one.