Purple Plum Polka Dots, Purple Plum Dots metal print by Shantelle. Bring your artwork to life with the stylish lines and added depth of a metal print. Your image gets printed directly onto a sheet of 1/16" thick aluminum. The aluminum sheet is offset from the wall by a 3/4" thick wooden frame which is attached to the back. The high gloss of the aluminum sheet complements the rich colors of any image to produce stunning results.