Typewriter key letter ring. 12 most popular letters. ABCDEJKLMRST All rings are adjustable and the base is made of surgical steel. Each ring is made with keys from an antique typewriter. Each finished piece is a unique work of art and makes a great gift or something special for yourself. Because real vintage typewriter keys are used, the appearance may vary, and keys may show signs of use/wear, adding character to every piece.