High refractive index glass beads are perfect retro-reflective materials. They are widely utilized for manufacturing reflective sheet materials for road sign, and they are also used for reflecting cloth, billboard, airport runways, shining painting materials etc..
High refractive index glass beads may be considered as spherical lens and it can returns incoming light to the original light source when reflecting layer is set in it's focus point. The position of the focus point of the glass beads is relied on its reflective index. The basic principal of retro-reflection of ordinary retro-reflective materials is shown as fig1 and fig2.

Product Properties
1.Shaped like perfect spheres with a smooth and shinning surface.
2.Remarkable strength, hardness and chemical stability.
3.Uniform reflective index to control it's focus point.
4.Uniform particle distribution.
5.Made of TiO2-BaO glass, and their refractive index is approximately 1.90-2.2.
6.No lead, No harmful to human.