Casual Class Series: These hand made frames are sculpted from pure G-50 Gun Metal and combine precise symmetry for added balance and comfort. Each style offers an adjustable, non-slip neoprene nose bridge, for select frame positioning. The spring loaded, soft rubber temple tips help keep the system stable while you enjoy clear, polarized optics without incurring any visual compromise. Each. Base frame cups the eye orbits to reduce annoying reflections caused by back light and give the glasses. sleek sharp appeal.