Description Martha. Sunglasses. Round shape and acetate paddle-type temples. Size Guide Lens Width (Caliber) 53mm Bridge Width 17mm Temple Length 143mm Material & Lens Quality Mazzucchelli organic acetate made of cotton and wood pulp, hand-crafted. Stainless steel soul. OBE riveted hinges, reinforced with five to seven stainless steel teeth. The type of lens is your choice at the optician. 100% UVA UVB 400nm sunglasses. Base 4 flat lens curve. Hardened treatment on the lens and anti-reflective on the inner surface with blue reflection. Exchanges and returns 2-year replacement guarantee on spare parts. 30 days to return the product free of charge. Pick up at the requested address. Refund via the same payment method used. Martha is a flawless sunglasses and eyeglasses design. This is a highly recommended prescription frame for any type of prescription. Available in three frame colors, each one more spectacular than the last. The shape has a 3D architecture, creating the effect of wide-framed glasses, but at the same time, they are thin and therefore very light.