DANIEL SMITH Style 97 Metal Frame by Nielsen - Florentine Black. Of all the metal frames we have seen, Nielsen is clearly the leader in quality and durability; they are heavier and structurally stronger than other similar metal frames. Made from the highest grades of aluminum, they have a brilliant, flawless finish. This frame offers a versatile modern profile with a wide face and squared edges. All colors feature a subtle brushed-metal Florentine finish.