This sign was printed using the Roland Soljet EX Glossy Calendared Vinyl, Permanent Adhesive 3 mil:

This high-quality 3 mil glossy adhesive-back vinyl is designed for many types of graphic applications. It images nicely in a variety of print modes and has a permanent adhesive for a variety of applications. While not conformable to rivets and irregular curves or indentations, it is durable both laminated and unlaminated, although lamination is recommended for protection against abrasion and chemical deterioration.