The phrase 'major components in' is correct and usable in written English.
For example, you could use it in the sentence: "He detailed the major components in the repair process."
Lighting, color, materials and decorations are major components in the message, Mr. Mannetta said.
Meats are often one of the major components in a frozen meal.
(Algae are major components in boghead coal, a type of sapropelic coal).
Large polycyclic aromatic hydrocarbons (LPAHs) were found to be the major components in the complex mixtures.
The thermally stable phenols, ethers, and carbonyls become the major components in 1000 °C annealed TRG.
Process synthesis, modeling, and experiments are the major components in designing industrial wastewater treatment plants.
Heat exchangers are major components in refrigeration systems where they are used as evaporators or condensers.
Fluid pumps are one of the major components in engineering domain.
In the Mississippi River system, for example, smectite, illite, and kaolinite are the major components in the upper Mississippi and Arkansas rivers, whereas chlorite, kaolinite, and illite are the major components in the Ohio and Tennessee rivers.
Made-in-Taiwan chips are major components in many of the world's PCs, smartphones, cameras and other gadgets.
Conservationism, protectionism, the science of ecology, and deep ecology are some of the major components in the political and ethical movement of environmentalism.
