These large sign KITS  are ideal for your front line while helping avoid local sign ordinances. Made of weather proof plastic (5 mil cororplast plastic), each set contains four signs that are 42″ tall x 30″ wide each. Flexible material allows signs to wedge under any hood while the vehicle’s normal hood support is used to support the hood.

https://www.featherflags.com/product/NEW-UNDERHOOD-SIGN-KIT-WEEKEND-SALE-25206/