1. WIDE USE AND APPLICATION: Window seal is the ideal companion for plastic windows and patio doors. It is suitable for common plastic windows and patio doors, as well as wooden doors with appropriate grooves and can be easily mounted by pressing into the groove. This sealing strip for window tracks is used for plastic, aluminum, and wooden windows, reducing the penetration of dust from window slides and making your windows look more beautiful. 2. TWO SIZES TO CHOOSE FROM: We two different widths of 0.62 in (16mm) and 0.98 in (25mm). The 0.62 in (16mm) width of the window seals is for gaps of 0.55 in (14mm), the 0.98 in (25mm) width of the window seal is for gaps of 0.90 in (23mm). Note: Please measure the gap size of the door or window and choose the correct size product. 3. WINDOW SEALS: Window seal Utype made of preferred silicone rubber for cold resistance, strong weather resistance and aging resistance, flexible without deformation, suitable for window and door sound insulation, keeping your room cozy and quiet! In addition, it is also windproof and dustproof, keeping your room warm and sanitary. 4. EASY INSTALLATION: First measure the gap size and length of the window, select the correct size of the thin window frame seal, then clean the dust and dirt in the groove, simply press to install easily, and the excess part can be cut off with scissors.