The phrase "are mostly used for" is correct and usable in written English.
It can be used to describe the primary purpose or function of something in a general context.
Example: "These tools are mostly used for enhancing productivity in the workplace."
Alternatives: "are primarily utilized for" or "are mainly intended for".
In Italy, tart Moros are mostly used for juice.
"Now woods are mostly used for people to walk their dogs.
Here are some examples: Agricultural crops are mostly used for their carbohydrate components.
It even includes a famous broadcaster seated at his microphone.Today, however, the fields are mostly used for football.
"Our chemical products are mostly used for additives, not for animal feed," said Li Xiuping, manager at the Henan Xinxiang Huaxing Chemical Company in central Henan Province.
There are digital voice recorders like the Olympus VN-3100PC ($69) that are mostly used for dictation and other voice-recording tasks.
The desktop printers sold in iMakr are mostly used for making knickknacks, but the devices will progressively become bigger and more powerful.
In the United Kingdom commissions are mostly used for special investigations and are distinguished according to their terms of appointment as royal, statutory, or departmental.
But the trucks, which lack armor and are standard commercial vehicles, are mostly used for logistical tasks like transporting generators and lighting rigs, said Lt. Kenneth Beatty of the Emergency Service Unit, which has seven tractor-trailers at its disposal.
They are mostly used for surveillance, but have also carried out more than 200 missile and bomb strikes over the last year, including 14 strikes near Marja in the last few days, newly released military records show.
Set around a working lighthouse on the north-eastern tip of Salina, the estate produces malvasia grapes that are mostly used for dessert wine redolent of wild herbs and honey, although an aromatic dry white has also recently been developed.
