They are the standard BMW panniers, available as an optional extra for that model of bike.
IMO they are tougher than they look - the outside "aluminium look" covers the same black plastic material of the rest of the panniers.
The inside arrangement is expandable (the same BMW system that is used on other models) which can be handy if you are packing less kit (the overall width can be minimised in that case).
They have a two hook arrangement that goes over the lower fitting bar and a single attachment point at the top; so three fixing points per pannier feels OK for the security of the system.
Like any panniers, if you drop the bike onto them enough times, and hard enough, and at a fast enough pace, then they are going to break; it's the laws of physics and materials technology after all
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Dave
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