The phrase "are basically composed of" is correct and usable in written English.
You can use it when describing the fundamental components or elements that make up something.
Example: "The majority of the Earth's atmosphere are basically composed of nitrogen and oxygen."
Alternatives: "are primarily made up of" or "consist mainly of".
SDPs are basically composed of service consumers (SCs), service providers (SPs), and service directories (SDs).
These materials are basically composed of UDMA and microparticles, which can be directly applied to the cavity preparation without the need for acid etch or any previous treatment.
The granite stone industries produces vast amount of by-product rock waste and as a result, many residential and agricultural areas are settled over the landfills which are basically composed of these waste materials.
Mosaic PBP2 structures are basically composed of fragments analogous to PBP2s in Neisseria species.
PNs are basically composed of large aggregating chondroitin sulphate proteoglycans connected to a hyaluronan backbone, stabilized by link proteins and cross-linked via tenascin-R (TN-R).
Through the results of field investigations and sample analysis, the Jokhang temple wall painting is basically composed of five parts (from inside to outside): the basic support (flagstone wall), the ground layer, a white preparation layer, paint layer and a surface protective layer or varnish.
"It was basically composed of false information about the effectiveness of condoms,and birth control and any form of contraceptive.
It is basically composed of found forms visually connected in space: a skinny dead sapling fixed upright in the ground lines up with a nearby construction crane from which the artist has suspended two ladders, which in turn lines up with the form of the Empire State Building seen across the river in Manhattan.
