Introduction
Material adopt the microprism reflection principle. People know that the light reflection has diffuse and specular reflection, why reflective material could reflect the light back, it attributes to its high refraction glass beads, when a bundle of light shine onto surface of glass beads in a certain distance and in any angles, because of high refraction of glass beads, the light will be gathered on reflective layer behind glass beads, the reflective layer will parallelly reflect the light back along the road that they are shined in, this forms retroreflection, when many glass beads reflect the light simultaneously, the scene of brightness will happen in front.  

Reflective principle: 

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