Aluminum parts that are stamped, molded. extruded, saw-cut, etc. all need to be deburred. These parts also typically need a specified surface finish. While dense, aggressive media like Ceramic Media will deburr the parts, the matte, tumbled finish and heavy edge rounding is often unneeded.
Softer metals like aluminum tumbled with lighter medias like Plastic or Synthetic Media can result in lightly deburred edges and a smooth surface finish. The part above (before part on right, deburred part on left) was vibratory tumbled with a Plastic Triangle media for only 1 hour. The smooth, matte finish is ready for accepting a coating or anodizing.