2521 Glasses by Lindberg. Color: 10, 20, 25, 30, 35, 60, 70, 75, 77, 80, 85, 90, 95, GT, U12, U13, U16, U9, Size: 51, 53, 55, Bridge: 22, Temple Length: 145, Temple Design: Basic. LINDBERG's frame 2521 combines angular lens contours with the brand’s signature floating aesthetic. Made of ultra-light titanium, it feels like air while holding firm. Its precise geometry appeals to fans of structured simplicity. Form follows function—and beauty.