It seems that Galaxy Z Flip include the magnets. Is this magnet safe?

Due to the flexible nature of the form factor, while the hinge enables a seamless unfolding and folding experience, the magnets in the Galaxy Z Flip hold the two sides together securely. It is harmless to most users but may be sensitive to medical and magnetic devices such as pacemakers or implantable cardioverter defibrillators. If you are using any of these medical devices, keep your device a safe distance away from them and consult your physician before you use the device.

And, we recommend not to place your device near magnetic fields. Magnetic objects, such as credit cards, passbooks, access cards, boarding passes, or parking passes, may be damaged or disabled by the magnets in the device.

Samsung always employs strict quality control and safety measures to ensure that devices meet and exceed industry safety standards.

All Samsung smartphones undergo rigorous internal inspection tests, and are always being controlled under Samsung’s high level of quality standards.