They have a cut out for the door handle slits to fit around the hinges and velcro sewn onto the back for quick and easy installation.
Soundproof door panel.
You can also coat the door with sound absorbing paint which can reduce external noise by nearly 30.
Then seal the gaps with a door gasket door sweep or spray foam to prevent air leaks.
To soundproof a door install a curtain rod over the back of the door and get a heavy fabric drape to hang from the rod.
Acoustic door blanket panels overlap the door and extend beyond the frame to prevent acoustical leaks.
If adding many soundproofing elements to your door seems like too much work try adding an acoustic door panel.
These panels offer a step up from gluing a sheet of plywood to your door but they re not generally as expensive as high end solutions like fiberglass soundproofing blankets.
To soundproof a door make it structurally strong enough to block noise by replacing it with a solid core door or by adding mass loaded vinyl soundproof blankets and panels to the existing door.
If you are willing to change your doorframe to a metal one then this is a very effective door sealing method which will make a huge difference to the sound resistance of your door.