Respond to Inquiries
When people ask about your product, they're obviously interested. Sending this type of brochure is for a qualified buyer.
They're qualified because they're much more likely to buy than someone who hasn't contacted you. Since they've already expressed interest, write this brochure to take your prospect to the next step: the buying process. Hammer home all of your sales points and pack your brochure with facts to convince them they can't live without your product.