NinjaCrafters Aluminum Rectangle Practice Sheets for Hand Stamping - Three (3) 20 gauge 3"x6" 20 gauge, 1100 Aluminum Unfinished Metal Stamping Blank (3"x6") Raw blanks for practicing stamping, pack of 3 - different sizes available - many other uses for this sheet as well! Great for practice, or cut with shears to make your own tags, rings & more! Soft temper and easy to work. Genuine NinjaCrafters blanks; hand cut in our workshop from US-sourced, pure 1100 aluminum Mill finish; there may be some surface scratches; unpolished., raw aluminum sheet A good way to start learning how to make some of your own metal stamping blanks