Glass beads reflectors employ the principle of sphere-reflection: If a beam of light hits a retro-reflective optical system, it is reflected back to its point of origin, irrespective of the direction from which the beam strikes the reflector.
As a reflector is subjected to enormous mechanical stress from vehicles, its surface must be as resistant as possible, glass is the material for this load.
43 beads reflectors
All color beads and all color base board are available)
Weight: 15grams/each piece