Check Your Oil- Coroplast Panel for WindmasterTM FP FrameCar maintenance is very important, and having the means to help your customers with it is a great way to increase customer convenience, while making some extra money as well. Increase impulse purchases with this full color digitally printed coroplast poster grip frame insert. Panel says, "Have you Checked Your Oil?" Panels slide onto spring extensions in the base and lock in place Printed on both sides Use with WindMaster FP Curb Sign Frame (U WMFP)