This is a simple gray silicone door stopper. I purchased it in 2023 and hung it on a doorknob for about a week. It has a leather string, so you can hang it on the doorknob when not in use. You can keep the door open to your desired position, allowing you to ventilate the room while keeping an eye on the inside. It firmly holds the door from both sides. It's very stable and will hold the door securely even on windy days. Also, its simple appearance blends in without looking out of place. Recommended for those who want to let in only the wind without letting pets through, or conversely, want to create a passage for pets, or for those who don't want their Roomba to close the door! Size: Approximately W6.2 x D6.2 x H2.4cm Weight: Approximately 65g