You can use it with a cover on a badge of about 55mm (◍•ᴗ•◍) Front: There is a ribbon to attach a safety pin, so you can use it without making a hole in the rosette itself. A magnet is placed inside the felt, so it is stable when the badge is attached. Back: There is a ribbon to attach a safety pin or ball chain, so we recommend using it together to prevent it from falling. The main body is made with double-sided tape for temporary fixing and fabric glue. The parts are attached with a glue gun. Please be careful when handling it, as it may be damaged if excessive force is applied. If a part comes off, please reattach it with adhesive or a glue gun. There may be some glue overflow. Please understand that this is a handmade item before purchasing (*ᴗ͈ˬᴗ͈)”