High Temperature Flexible Magnetic Sheet 220mm x 220mm capable of temperatures excess of 150 degrees celsius. It has been tested for hours at 150 degrees celsius without loosing its magnetism. The sheet has a very strong magnetic strength and can be easily cut by scissors or a sharp knife.
The high temperature flexible magnetic sheet will need a 3m adhesive sheet if you require to stick it down, if adhering 3M transfer tape to the magnetic sheet, adhere to the less magnetic side (the non shiny side). https://www.andornot.co.uk/product/3m-468mp-220mmx220mm-adhesive-transfer-tape/