Quad mallets are specialzed mallets with a tip designed for quad drums. These tips are made to make the best sound out of each drum. Since quad drums are tuned differently, these mallets are better for quad drum sound quality. The tips of these mallets can vary in shape, size, and weight. This all depends on the drummer's preference, and what mallet is the easiest to drum with.
Mallet
Mallet: John Mapes
Mallet
Mallet: Tom Aungst