Aluzinc is a type of Galvanised Steel made in Sweden. It is used in construction to clad buildings, has excellent weathering properties and can be formed into many shapes and sizes.
Aluzinc does not dull down like ordinary galvanised steel and will not water mark. However care must be taken in transit that two planters do not contact each other otherwise marking will occur.
The picture shows some standard shapes and sizes although bespoke units can be easily made.