Use premium environmentally rubber: This kind of door stopper is made of good quality rubber material, will not damage the ground, and has no traces. Strong grip, no damage to the door. Use it safely and securely. If the rubber door stopper is dirty, you can clean it, wipe it dry and use it again, the effect will be better. Suitable for door gaps of various heights: It fits under most door gaps and will withstand daily use without cracking apart. These door stoppers measure L 4.83" x W 1.6" x H 1". They will fit under most of the doors hanging anywhere from 0.2" to 0.8" off the floor. If the door gap is higher than 0.8", you can stack the two door stoppers together, and they are suitable for use, so that the fixing force is stronger. These stoppers rely on a sloped design to keep doors from closing on their own. Applicable to a variety of different grounds: This door stopper can be applied to a variety of different grounds, with strong grip, such as wood, cement, vinyl, tile, or carpet. The rougher the ground, the stronger the grip of the door stopper. Easy to use: Our door wedge just needs to be placed on the bottom of your door. There's no need for drilling holes or using adhesive tape. No sticky residue or ugly markings left behind. These rubber door wedges allow you to move freely in between rooms of your home, school or office, without having to open and close your doors every time. At home or office giving you enough to use for multiple bedroom, classroom or office doors etc. Free for holder hooks: Comes with free holder hook each door stopper to hang the product on any door (or wall) and keep them safe and organized, in case the rubber door plug is lost.