These pens are of many different colours.
这些笔有许多不同的颜色。
The two rooms are of a size / of the same size.
这两个房间大小一样。
He is of the same weight as his brother.
他和他弟弟一样重。
The productive forces were of a very low level.
生产力处于非常低的水平。
City Lights and Modern Times were of this kind.
“城市之光”和“摩登时代”就是这种影片。    
注意：此类句型中的某些表达可以转换成  “be + different / the same + in + 抽象名词” 的形式。如:  
Coins may be different in size, weight, shape, and metal.
These pens are different in colour.
The two rooms are the same in size.

                                                      江苏 杨定生