The stencils are made of non-magnetic material, most likely of aluminum alloy, but are quite rigid- no objection. But "accuracy", as it may be called, madness 1-2 degrees- is unacceptable. Some angles, such as large interiors, are more accurate. I will measure in the near future. But most likely that I will start to make a claim, not for the whole amount, but 50-70%. I do not recommend buying. In photography 1-2 degrees is hard to follow, but believe me there are two 60 degree samples, but putting the outer angle to the other inner to the light has an irregular gap.
An item arrived today. thanks