The material inside the microcapsule is referred to as the core, internal phase, or fill, whereas the wall is sometimes called a shell, coating, or membrane.

This allows attacking a full range of target areas (including punches and kicks to the face, head, throat, and body) with no padding or protective gloves, but maintains a degree of safety for the participants.

Although it may appear superfluous to state that the breach of an international obligation may concern an obligation set by the rules of the organization, a specification to this effect would serve some useful purpose, given the paramount importance that rules of the organization have in the life of any organization.