Review on XDG Outbreak Response Dust Proof Anti Rust by Mike Marks

These badges are great value for money; sharp and colourful. But be careful. They are just as concave on the back as the convex surfaces (about 3/16 inch). Result: If you stick to a flat surface as recommended, the adhesive contact is limited to the edge. On the other hand, sticking to a curved or spherical surface can work in your favor.