1. nd1.93 32-106um 2. brightness over 550cpl 3. best quality and service 4. cheapest price 5. promptly delivery Areas Of ApplicationBecause of the perfect characteristics of retro-reflection, the high refractive index glass beads of ND1.93 series can be used for reflective fabric, such as reflective cloth, reflective silk, reflective tape and in the fields of personal security and protective ...