Set of 20 Made of bright colored acrylic available in orange or yellow Lightweight yet extremely durable Can be used on any surface including walls and other vertical surfaces when used with StikkiDots or other adhesive material Easy to clean and reuse over and over Bright colors provide high visibility and differentiation against many backgrounds SIRCHMARK Evidence Marking Pointers allow an investigator to clearly mark evidence and items of interest at a crime scene. The arrow shape can be used to indicate specific points of interest or unique characteristics of a piece of evidence that need to be photographed and documented. Set of 20.