One shown 1.8mm dia. perforation (standard), one shown the 0.5mm dia. perforated hole (up-to-date and only available for the alum. materila). Tile powder coating passed ASTM E84 class A, BS476 part 6
The custom-made alum. ceiling tile is optional for colors (gold or silver) and patterns. It is ideal for company logo or company trademark or special meaningful pattern to catch consumers` eyes.