These are examples of thin metal plates (such as steel or tin) that are easy to obtain and react to magnets. It is recommended to use plates with a thickness of 0.3 mm or more. If the plate is too thin, the magnetic response will be weak. Option 1 is suitable for those who assemble many models as they can be obtained in large quantities. Options 2 and 3 are recommended for those who only assemble one or two models.

Product Data 1) Paper Fasteners
Website: Amazon
Material: Steel
Feature: Can be disassembled into two pieces, effectively providing more than twice the number of metal plates.

2) Snap-Off Blades
Website: Amazon
Material: Steel

3) Washers
Website: Amazon
Material: Steel