LINDBERG (Linberg) These glasses use different materials. The highlight is that the titanium frame design only half frame with nylon line Premium quality titanium frames undergo a laser cutting process resulting in beautiful shapely forming half frame titanium frames. Combined with special nylon threads that perfectly hold frames and lenses, it is lightweight, durable, and looks stylish in the style of LINDBERG (Linberg)_cc781905-5cde-3194-. bb3b-136bad5cf58d_It is also LINDBERG's most durable, long-lasting frame.