PRICES MAY VARY. Size: 12x16 inch(30x40 cm) Higher Quality:This Aluminum Sign Is Made Of Aluminum/Metal Iron And Is Brand New. Easy To Install:This Metal Aluminum Sign Of 24 Hour Circadian Clock Organ Clock Unframed Knowledge Are Pre-Drilled With 4 Holes In Each Corner To Facilitate Hanging And Save Time. You Can Install It On The Wall With Nails Or Double-Sided Tape On The 4 Corners. Metal Sign Perfect For Any Area Or Room, Such As School,Club, Garage,Kitchen,Coffee, Bar. No Matter Where It Is,