A Brass Head Hammer or Mallet is an essential tool for tapping your stamp onto your metal blank. Brass mallets come in 2 sizes. The 1lb. mallet is lighter to lesson arm fatigue, where the 2lb. mallet packs a harder hit when needed. Double impressions vs clear impressions. Brass hammers and mallets evenly disperse the energy of the strike, preventing double impressions. Used Brass Hammer Brass is a softer metal than steel so it helps prevent stamps from becoming damaged.