Weight Disk: Heavy Attack
Compact and Heavy, basically a standard Heavy with rounded protrusions on each corner.
Weight is similar to Ten Heavy due to the additional added mass from the corners, with a more compact distribution.
Rounded protrusions (attack points) result in severe recoil when hit, and do not add significant attack.
This means Heavy Attack's weight can only be used defensively on combinations which shield it from contact, basically Weight Based Defenders with wide or overhanging Attack Rings as well as fairly wide bases (both competitive Weight Based Defense bases are wide enough for this, though SG Metal Ball's height is a concern for non-overhanging ARs. This also allows it to be used for Traditional Upper Attack, though this is not a competitive type. This does however preclude it from use for Compact Customizations.
Generally, the fact that Ten Heavy is easy to find and cheaply available and arguably a better choice due to similar weight and better survival, not to mention being more versatile, means Heavy Attack sees little competitive use. However, it is still competitive on suitable customizations.
With faster Attack Blade Bases (i.e. Defense Grip Base (Tip Inverted) and SG Grip Change Base Tip setups), Heavy Attack can be used without loss of speed, and its high weight becomes quite useful with Attack Rings such as Square Edge and Hayate Attack Ring to improve rotational smash, however the reduction to the flywheel effect otherwise provided by Wide Defense or Ten Wide tends to result in more recoil KOs. It is nonetheless an acceptable option,
Overall, an interesting and niche but competitive part, but not a must-have.