Using High Quality Eco-Friendly RubberThe door stop is made of high quality rubber material, which will not damage the floor and leave no traces. The award is firm and will not damage the door. Safe and reliable to use. If the rubber door stopper isdirty, 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 stopper measures 12.3cm x 4.1cm x 2.5cm. They are suitablefor 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 on top of each other, which is very suitable for use and has a stronger hold. These stoppers have an angled design that preventsthe 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 only needs to be placed on the bottom of the door. No drilling or tape required. No stickyresidue 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, enough bedrooms, classroom or office doors, etc.