If you're looking for ultra-thin round magnets in stock, check out this model: 20mm in diameter and 0.5mm thick (20x0.5mm),...
This is a small and thin round magnet with a thickness of less than 1mm, a diameter of 3mm, a thickness of 0.8mm, nickel-copper-nickel protective layer on the surface, magnetized thickness, the performance can be selected from ordinary N35-N52, or temperature resistance grade,...