Dear :

Thank you for your letter of inquiry.

Our company has been producing quality [product] since [year]. We have an excellent reputation for quality and good services throughout [country/area]. For your reference, I have enclosed a brochure of our company and a catalog that describes our products.

Please contact me if you need more information. Again, thank you for your interest in [company]. We look forward to serving you.

Sincerely yours,

[name]

[title]

Encl.