User blog comment:DeltaStriker/MoC Blog I - Assorted Creations/@comment-5900628-20150119175131/@comment-5900628-20150219200631

Add-ons: Any pieces designed to be attached to CCBS armor shells. By "white add-ons", I'm referring to the piston pieces that came with Kopaka and the Protector of Ice.

Skrall looks much better now. (Although you could still do something about the exposed forearm pins and open balljoints)

I was saying that the thighs might look better if they looked more like the thighs on this or this.

Exposed balljoints just look bad in most places, and detract from the MOC's general appearance.