Features: These ceiling light covers are easy to install. First step is to open the fixture, you need to open the tab to unlock the fluorescent light frame, gently lower the frame and let it hang naturally. Then place the fluorescent ceiling light covers (patterns side down) on top of the hard light diffuser. Finally, close the clamp by lifting the frame and locking the tabs. These overhead light covers for classroom and most places can as gifts for your family members, relatives, friends, colleagues, and those who have decoration needs, enhancing your interpersonal relationship. Specifications: Material: PVC Color: green Size: about 4 x 2 ft/ 122 x 61 cm Package includes: 12 x Forest fluorescent light covers Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays.