Specifications: 9cm x 4cm, 4 wedges, transparent. Non-slip design: The door stopper is made of soft silicone and is designed with grooves on the bottom surface to hold the door firmly in place and prevent it from sliding or closing. Adjustable height: 4 door stops can be stacked together to fit gaps up to 90mm, 1 door stop can fit gaps as small as 3mm. Please measure the height from the bottom of the door to the floor before purchasing! Safe, environmentally friendly and durable: The door stopper is non-toxic and odorless, and is made of high-quality silicone rubber to ensure safe use. Universal application: Easily fits into door gaps, suitable for all surfaces, carpet, concrete, tile and wood. Wooden doors, metal doors, glass doors, etc.