The Please Knock sign has a circular opening and a narrow slit on the side, so no matter what type of doorknob or handle you have on your door, our sign will it and stay there! Our double-sided door hanger sign has Do Not Disturb on the front to ensure your peace and welcome, please knock on the back. Features -Color:Assorted Color -Material: -Size:22.50X8.50X1.00cm/8.84X3.34X0.39in -Made of sturdy , scratch resistant ensures this is and provides you with long term use and value. - Simply flip the Do Not Disturb door sign according to your needs at the time to prevent people from entering the room or knocking. - No matter what type of doorknob or handle on the door, our door sign can it and stays same! - Made of premium materials, easy to install and remove, no other tools required. - Double sided: one side is printed PLEASE DO NOT DISTURB, the other side is printed PLEASE knock, this is very easy to use. Package list: 4 x Door Signs