Using High Quality Eco-Friendly Rubber The door stop is made of high quality rubber material, which will not damage the floor and leave no marks. The reward is firm and won't damage the door. Safe and reliable to use. If the rubber door stopper gets dirty, it can be washed, wiped clean, and used again for best results. Suitable for door openings of different heights: suitable for most door openings, will not crack when used. The door stop size is 124*39*25mm. They are suitable for hanging anywhere between 0.5" and 0.8" on the floor. If the door gap is more than 2.00 cm, two door stops can be stacked, which is very suitable for use and has a stronger grip. These stoppers have an angled design that prevents the door from closing on its own. Tiles, floor mats, etc. plus the thicker the floor, the stronger the adhesion of the doorstop. EASY TO USE: Our door stop just needs to be placed on the bottom of the door. No drilling or tape required. No sticky residue or unsightly marks. These rubber door wedges allow you to move freely between your home, school or office without having to open and close the door every time. At home or office, adequate bedroom, classroom or office door, etc. Colour: Grey Package contains: 3 pieces of door stop