The item is thicker in the middle and thinner on 2 sides , the middle thickne is approximately 2 mmInstallation Method1. Thoroughly clean the place where the car body needs to be pasted. If there is oil or wax, wipe it off with alcohol.2. After tearing off the protective film on the back of the bright strip, stick it carefully, and then subtract the exce.3. If the temperature is under 20, it's suggest that you heat the back tape by usinghair dryer, so as to improve the stickne.4. For make sure the item stick securely, please do not wash the car within 2 days after installation.Size Recommendation: (Only for reference, the precise size please measure your car for confirm)Front window---length: 3-3.2m, width 2cmRear window---length: 2.8m-3m, width 2cmRearview mirror---length: 0.3m, width 1cmDoor side---length: 1m, width 1cmUpper light eyebrow---length: 1m, width 1cmLower light eyebrow---length: 1m, width 1.5cmFour corners---length: 2m, width 1-2cmFront car circumference---length: 2.6m-3m, width 1-2cmRear car circumference---length: 2.8m-3.2m, width 1.5-2cm