The phrase "are composed of roughly" is correct and usable in written English.
It can be used when discussing the approximate composition or makeup of something, often in a scientific or analytical context.
Example: "The human body is composed of roughly 60% water, which is essential for various bodily functions."
Alternatives: "are made up of approximately" or "consist of about".
The various membranes playing these vital roles are composed of roughly equal weight percent protein and lipid, with carbohydrates constituting less than 10 percent in a few membranes.
Sums in the same rough temporal neighborhood are composed of roughly the same simples and are structured in roughly the same way.
In each bootstrap instance, we created a bootstrap sample by selecting 142 observations with replacement from the original data, which on average are composed of roughly 90 unique patients.
Blackstrap molasses from cane is composed of roughly 55 percent sucrose and other sugars, 20 percent water, 15 percent organic nonsugars, and 10 percent ash.
The authors propose moving on to the Drosophila fly, which has 135,000 neurons; the zebra-fish, with roughly one million neurons; the mouse; and then the Etruscan shrew, the smallest known mammal, whose cortex is composed of roughly a million neurons.
The body of a healthy lean man is composed of roughly 62 percent water, 16 percent fat, 16 percent protein, 6 percent minerals, and less than 1 percent carbohydrate, along with very small amounts of vitamins and other miscellaneous substances.
The prefecture is composed of roughly the southwestern two-thirds of the Ryukyu Islands, that archipelago forming the division between the East China Sea to the northwest and the Philippine Sea to the southeast.
The George Washington Universtiy is composed of roughly 10,000 undergraduate students, hailing from over 130 different countries.
The Sanders movement is composed of roughly 12 million supporters who voted for him in the Democratic primaries.
