Hi I need some help

We are an established wholesale business distributing a certain kind of automotive part, this part is highly demanded by mechanics.

We originally sold this part to other wholesalers whom then sold to the mechanics, however due to changing times we want to sell direct to mechanics. In our area there are 3500 mechanic shops.

Problem: we need to send each of these mechanics a catalogue and we need them to open it and start using it.

We will ring everyone of the mechanics first, but we understand that when mail is sent it is not always opened and read.

Please if you have any suggestions to how we can entice the mechanics to open their mail. please reply:-)