This peanut feeder is described as. “ made of light, strong and corrosion resistant aluminium “ , this is the reason why it was purchased. The hanging loop at the top appears to be made of stainless steel , it’s non magnetic so it’s fine. The outer cage is magnetic so it’s steel with a painted finish. The inner cage again is made from steel. The top dome, the perches and the small bottom dome are non magnetic so would appear to be the only aluminium parts of the feeder. The large bottom dome is again magnetic and is probably made of steel and as it is spot welded to the outer cage will be liable to corrosion in a very short period of time. Spot welds without plastic coating or very heavy coats of paint are particularly prone to corrosion. Disappointed with the product.