The aluminum was very thin (God help us!), like thick aluminum foil, it fell from our hands from less than a meter high (from the extractor hood to the kitchen) and it bent in three places, even the little teeth that hold it got messed up. Maybe I was used to my own filters (of the same value nonetheless) which have been indestructible for so many years, despite frequent use. In any case, I do not recommend them at all!