The 77389 is a self-adhesive pipe marker pre-printed with the text 'HELIUM'. Constructed from durable B-946 vinyl with a gloss finish, this marker measures 2.25 by 14 inches and is designed to fit pipes with an outer diameter ranging from 2.5 to 7.875 inches. It features a permanent, cold-temperature acrylic adhesive and can withstand service temperatures from -40°F to 180°F. With good chemical, oil, and water resistance and an average outdoor durability of 8 to 10 years, it is suitable for both indoor and outdoor pipe and valve marking applications.