Looking on the internet deeply has found these results:

They are experts in products is the most popular phrase on the web.

They are experts for products 10 results on the web	They are experts in products 14 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Jun 4, 2013 ... Join us and see how some of the world's most progressive companies are building great customer connections by delivering outstanding�... Jul 22, 2013 ... "A lack of transparency within your business will likely impede your team's effectiveness and ultimately affect how you engage with your�... They are experts in products like musical instruments, calculators, mobile phones , cameras and watches. The company was established in the year 1946. Jul 21, 2014 ... The best sales people often leverage many experts in their company that aren't in sales. They are experts in products, finance, and service.

They are experts for products

10 results on the web

They are experts in products

14 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Jun 4, 2013 ... Join us and see how some of the world's most progressive companies are building great customer connections by delivering outstanding�...
Jul 22, 2013 ... "A lack of transparency within your business will likely impede your team's effectiveness and ultimately affect how you engage with your�...
They are experts in products like musical instruments, calculators, mobile phones , cameras and watches. The company was established in the year 1946.
Jul 21, 2014 ... The best sales people often leverage many experts in their company that aren't in sales. They are experts in products, finance, and service.