Melding today's style with the safety that flameworkers need, these stylish plastic frame glasses are comfortable, lightweight, and feature polycarbonate lenses. B3-Series: This series of eyewear offers the same protection as the "SB" series but has the addition of a welder shade #3 for additional brightness reduction. The eyewear in the "B3" series would typically be used by the borosilicate glass lampworker. Offers Sodium Flare, UV, and IR protection. - SHADE 3 LENSES