Automaticly implant concave and convex part of rough surface
That double layers lock vacuum layer is stable and firm style
Do without nail or drill, leave no trace when use time and time again
SMOOTH SURFACE: All airtight smooth surfaces such as glass, ceramic, acrylic, marble
ROUGH(NON-SMOOTH)SURFACE: Concave and convex airtight surface such as concave and convex grain ceramic, archaized brick, frosted glass, painting wood and so on