The holder for the chips is a half-cylinder shape, maybe 3"x4" and 1.5" deep? The wood chips I buy for smoking (from Home Depot or outdoors stores) are about the size of mulch and fit fine. I have also bought chunks before, which burn a bit more slowly, but about half the pieces in the bag were too large for the chip holder and had to be cut down (see photo below below for size).
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