A bit chunky - think the size of your regular biscuit, only thicker. To place it on the surface you have to scrape and apply a much smaller double-sided square stick that doesn't hold well. This means that unfortunately the scent tends to fall off the surface it is placed on; placed in the lane (easy to hit) or on the cover. For me, this contradicts the purpose of the device. I ended up throwing the rest of the pack away as it wasn't worth re-taping or adding extra tape. Otherwise, the smell wasn't bad and seemed to *mask* small smells well, but it didn't really *eliminate* them.
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