The 'scale' is the proportion of actual size the replica or model represents. Scale is usually expressed as a ratio (e.g. '1:35') or as a fraction (e.g. '1/35'). In either case it conveys the notion that the replica or model is accurately scaled in all visible proportions from a full-size prototype object. Thus a 1:35 scale model tank is 1/35 the size of the actual vehicle upon which the model is based. Models generally make no attempt to replicate scale weight, only size.