Most Roman pottery is light and smooth to touch and very tough, although, like all pottery, it shatters if dropped on a hard surface.
大多数罗马陶器轻巧而光滑，摸起来很硬，但像所有的陶器一样，如果掉在坚硬的物质上就会碎裂。
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It is very difficult to handle and it would be hard to ride on the roads as you need about six widths of road to turn. I think it is really built for Roman roads.
An example of nearly contemporary Roman writing on the subject shows an analysis which Milton Freidman (a famous 20th century monetarist) would have been hard pressed to better.