1,The size of the track is self‑cutting, and the crack size can be cut. It is suitable for plastic‑steel window and aluminum alloy window. 2,Easy to install, just tear off the self‑contained adhesive and stick it to use. It is suitable for aluminum alloy window and plastic steel window. 3,Soft TPE can be cut at will and has a wider application range. A set contains 4 pieces for upper and lower doors and window. 4,The wind block can solve the troubles of dust, wind and insects and keep them out. 5,Sturdy and durable, double rivets are pierced and reinforced, firm and not falling apart, not easy to fall off. 4 x Window Wind Block Item Type: Window Wind BlockMaterial: POMandTPEWeight: Approx. 134g or 4.7ozProduct Size: Approx. 10.3x 4.6cm or 4.1x 1.8inScope of Application: Aluminum Alloy Window, Plastic Steel WindowInstallation Method: Put the windproof block into the track and sign the height of the track with a pen. Use scissors to cut out the track activity space and tear off the adhesive protective film. Put the windproof block into the track and paste it on the upper and lower door frames, press It can be used in a few clicks. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.