States manufacturers began to use the metric system to describe miniatures, as opposed to the previously popular customary units, so that their table-top wargaming models would be compatible. The scale of a figure is often described in millimeters, for example one of the most common scales is 28 mm. While a model may be described as 28 mm the actual height of the model may be different. This is because of a number of factors such as manufacturer, model proportion, method of measuring the model, the model's pose, and what sort of man the model is meant to represent. A manufacturer might advertise its figures as 28 mm, but their products may be over 30 mm tall. Manufacturer's use of scale is not uniform and can deviate by as much as 30%. Some manufacturers measure figure height from the feet to the eyes rather than the top of the head; therefore, a figure that is 30mm to the top of its head could be considered a to be 28mm miniature. A further complication is differing interpretations of body proportions. Many gaming figures are unrealistically bulky for their height, with oversized feet, heads, hands, wrists, and weapons. Figurines with these exaggerated features are often referred to as "heroic scale". Some of these exaggerations began as concessions to the limitations of primitive mold-making and sculpting techniques, but they have evolved into stylistic conventions. Figures are commonly be used with a variety of scales. In 28 mm scale, short characters such as dwarves, hobbits, and goblins might be represented by figures in the 15 to 20 mm range while taller characters like ogres, trolls and dragons would use 30 mm or larger figures. It is not uncommon for there to be a mismatch between the game scale and miniature size. Chainmail used a scale of 1:360, appropriate to 5 mm miniatures, but was played with 30 mm miniatures, and the conceit that each figure represented 20 men. In many games there is a definite scale specified for the square grid that the game is played upon. One of the most common is 1 inch represents 5 feet. This specifies an exact scale of 1:60. That implies that a 28 mm tall figurine represents a person – which is a reasonable number for a modern 50th percentile male (See: Human height). Another popular scale is 1/72 or 1 inch equals 6 foot which uses