How To UseOpen the door and insert the stopper between the door and the floor.Check the door is completely stopped.Gap of the door from the floor 0.4~1.8cm.NoteThis product is only for door-stopping. It can not prevent accident or impact perfectly.Please use the product in incoor. Do not use with iron doors or heavy things. It causes break and hurt.There is no option of the color. So please tell us the color you want， or we will send you the color randomly.