Ray Ban Sunglasses. Series Erik. Series number - RB4398. Color code - 901/31. Shape - Square. Lens Width - 53 mm. Lens Bridge - 20 mm. Arm Length - 145 mm. 100% UV protection. Non-Polarized. Frame Material - Propionate. Frame Color - Polished Black. Lenses Type - Green. Rim Style - Full-Rim. UPC/EAN code - 8056597828871. Ray Ban Erik Green Square Unisex Sunglasses RB4398 901/31 53.All Ray Ban Eyewear may include Case/Pouch and may include a polishing cloth. Case size and color may vary.