... years experience in manufacture advertising equipment such as light box,showcase,sign panel,display rack,booth and so on ... Screen(Sticker): light-proof sticker,2 years span outdoor,3 years span indoor Light source:t8 philip,over ... hard to be broken,turn color 2 years span outdoor,3 years span indoor Hook:inner is metal ... when closing and protect inside from dust. outdoor/indoor metro light box signage