Our average size, 51mm. Your alter ego. Animating a classic lens shape, the HOWARD's bold rectangular proportions make for a flattering fit refined with a rounded inner silhouette. Chiseled edges and sharp corners give y'alls everyday uniform a more distinguished feel. Need HOWARD in a narrow (49mm) or wide (53mm) size? Lifetime Warranty Handcrafted, Luxury Acetate Eyeglasses RX Ready Size 51-21-145 This is our average sized HOWARD Premium Hard Case Microfiber Cleaning Cloth SKU: OHO1-091M-11CS-220