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According to the Yamaha Artists page, Matt Cameron uses a Yamaha Oak Custom Kit in Musashi Black with Vintage Hoops (http://www.yamaha.com/artists/mattcameron.html).
In a video interview with Cameron's drum tech, he goes through and explains the kit: "Starting with the kick, it's a 24x14. 12 and 13 tom, 16 floor, and 18 floor. The kit is a Yamaha Oak Custom. The size has been altered for Matt. The floor tom one has been shortened on the bottom so it's 16x14, and the rack one has been shaved one inch."
Here are the specs of the kit: 24x17 Bass Drum w/ Natural Maple Hoops, 12x8 Tom, 13x9 Tom, 16x14 Floor Tom, and 18x16 Floor Tom.
The source and notes on this submission are correct.
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