Tractors And Farm Machinery On Road Warning Signs - 24x24 Our Road Signs are Signs constructed of rust-free, heavy gauge, durable aluminum Our Road Signs made with 3M Engineer Grade Reflective sheeting and 3M inks Our Road Signs are rated by 3M for at least 7 years no-fade service Our Road igns with holes drilled at top and bottom center for easy mounting We manufacture our own Road Signs to meet all Federal MUTCD standards