Groggers (also spelled graggers) or in Hebrew ra'ashanim simply mean - noisemakers.
However, they do have a special importance during the holiday of Purim. When the
megillah (scroll of Esther) is read we make noise with groggers every time Haman's
name is mentioned to scorn him and his deeds. We say "Boo Haman" with
this noise and rejoyce in celebrating. Our groggers come in several shapes, they
are made of wood and plastic any one of these noisemakers will bring to life one
of the oldest Purim traditions. They are also great addition for mishloach manot.