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I had a (little) hard time finding the word 宣材{せんざい}. It was neither in the Midori dictionary nor Chrome's rikaikun extension. I had to google it.
I found an explanation here on kotobank but not much more. My question is, is it a relatively new word? Or simply it is not considered a "real word" but just a shortened form of 宣伝材料? Although in the second case I would still expect it to pop up in a dictionary such as Midori (maybe with a reference to 宣伝材料).
It's a common abbreviation in the marketing or showbiz field, but it's still jargon, and simply not common enough to be listed in generic dictionaries. You should be able to find this in a テレビ業界用語集, etc. It's also listed in this Wikipedia article along with many other words not in ordinary dictionaries. The meaning is easy to guess, anyway.
