DANIEL SMITH Style 11 Metal Frame by Nielsen - Anodic 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 is a very popular, clean lined profile used with watercolors, prints and drawings. It is not recommended for frames over 36".