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I will contact him with sending some materials. is the most popular phrase on the web.

I will contact him about sending some materials. 192,000,000 results on the web	I will contact him with sending some materials. 192,900,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
One afternoon I had left to go pick up some material. Tell me how to contact him and I will. To the depot, pick up some material. We've got to work on some material. However, I will look into this and contact him tomorrow before the vote. Of course, in view of the strike announcement, I will contact him again, and ask him to take the necessary special measures. I can helpthink of some material. I had a letter from the postal inspector warning me about sending some of my pictures through the mail.	Well then, I will contact Lady Hanae presently. I can helpthink of some material. Tell me how to contact him and I will. However, I will look into this and contact him tomorrow before the vote. To the depot, pick up some material. Of course, in view of the strike announcement, I will contact him again, and ask him to take the necessary special measures. We've got to work on some material. One afternoon I had left to go pick up some material.

I will contact him about sending some materials.

192,000,000 results on the web

I will contact him with sending some materials.

192,900,000 results on the web

More popular!

One afternoon I had left to go pick up some material.
Tell me how to contact him and I will.
To the depot, pick up some material.
We've got to work on some material.
However, I will look into this and contact him tomorrow before the vote.
Of course, in view of the strike announcement, I will contact him again, and ask him to take the necessary special measures.
I can helpthink of some material.
I had a letter from the postal inspector warning me about sending some of my pictures through the mail.

Well then, I will contact Lady Hanae presently.
I can helpthink of some material.
Tell me how to contact him and I will.
However, I will look into this and contact him tomorrow before the vote.
To the depot, pick up some material.
Of course, in view of the strike announcement, I will contact him again, and ask him to take the necessary special measures.
We've got to work on some material.
One afternoon I had left to go pick up some material.