The phrase "are actually composed of" is correct and usable in written English.
It can be used when explaining the components or elements that make up a particular subject or object.
Example: "The cake is not just a simple dessert; it is actually composed of layers of sponge, cream, and fruit."
Alternatives: "are made up of" or "consist of".
Asymmetric key pairs are actually composed of sets of related numbers that are plugged into advanced mathematical formulas.
It was observed that the spring-like carbon nano-coils are actually composed of two fused nano-coils.
The obtained Co/C composites with uniform polyhedron microstructure are actually composed of amorphous carbon frameworks and highly dispersed core-shell Co@graphite nanoparticles.
Therefore, the aging Se nanoparticles all transformed into nanorods, which are actually composed of two crystal structures, one is hexagonal structure and the other one is monoclinic structure.
Their focus is on whether knowledge is actually the same as true justified belief, or whether persisting objects are actually composed of temporal parts—issues which they take to be synthetic and a posteriori and not with whether these truths are necessary issues which may well have a different status.
The cellular filaments formed by the PSTPIP1-related proteins FBP17 and FCHo2 are actually composed of tubular membrane-associated structures which likely represent extended endocytotic vesicles that have not undergone scission [17], [19], [20], [21].
But the seemingly homogeneous crowd lining the road is actually composed of very distinct groups, divided roughly along national lines.
The string looked like a swath of adhesive tape, but it was actually composed of hundreds of separate strands of Siberian horsehair.
They were actually composed of twins, Claudine and Claudette, and their sister, Angella, who was 11 months older.
Our largest project, which is actually composed of 11 buildings, is 2.5 million square feet on the waterfront in downtown Toronto.
A quartet of recent, mosaic-like canvases look like experiments with bathroom tile, but they're actually composed of little squares of cast acrylic paint (sparkles are the result of pulverized compact disks).
