Rider signs are designed to sit atop or "ride" a standard Coroplast sign with metal pins or hang from the larger sign via chains or tie wraps (not included)
(Rider Pins sold separately)
These riders are printed double sided on 4mm Coroplast Plastic.
They come in various sizes
 
If you are adding a rider to hang from the bottom of your sign, you need to order the main sign with the holes on bottom as well as the top to have somewhere to hang the sign from.