This is a 6" Long hard plastic cover that snaps over your light bar which are 2.75" to 3.00" tall. Use multiple covers to cover longer light bars. Covers can be cut to size if necessary with a very fine tooth saw, sanding, or by scoring and snapping them to size (your risk on damage when cutting).
In some states auxiliary lights are required legally required to be covered. If you are purchasing colored light covers, ensure you check your local laws requiring legality.