Thanks yes its getting colder here hate it.
Iíve just tried something, the helmet shell doesnít attract a magnet which means it must be made from manganese steel i think! Yet the brackets on the shell do attract a magnet which means they are mild steel. The clips seam to slightly attract a magnet which makes me think they are made from a poor quality stainless steel because the magnet wont stick to my stainless steel sink in the kitchen.
Mind you i only have a fridge magnet to try them with.