Aura is Thought Space Athletics’ opaque premium plastic, moulded by MVP, and it’s the TSA blend with the widest range of colours and effects. Eight moulds are listed in it, and Nebula Aura is a swirled run.
That’s the grippy opaque class: comfortable in the hand, durable, workable in the cold. It’s the TSA relative of MVP Neutron.
Ethos is the clear TSA blend if lifespan is the only question.