Personalized College Bound 2023 Yard Sign, College Logo Sign, Custom Graduate 2023 College University Bound Yard Sign with Metal H-Stake. Economical and durable, our Coroplast Yard Signs are a staple of outdoor advertising. These Custom College Bound Yard Sign full color direct printed graphics are vertically fluted for use with an H-Stake. Coroplast is used for yards, parking, real estate, and election signs. They are waterproof.