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'''Rods''' - Rods offer a similar product to cubes however the surface area to volume ratio is even smaller. In addition, rods (and lumber) are the primary source for alternative woods. [http://www.homebrewersassociation.org/how-to-brew/resources/conference-seminars/?type=info&msg=3 See John Gasparine's 2013 NHC presentation on alternative wood aging] (AHA membership required).
'''Spirals'''- Wood spirals are basically rods that have been shaped to increase the surface area. They offer the same potential benefit as rods and cubes in dimension of toast flavor. Based on faster flavor extraction than rods, spirals may not be the ideal choice for brewers looking for the non-flavor benefits of wood.
'''Honeycombs'''- Honeycombs are similar to oak spirals in what they offer and they maximize the surface area even more.
==See Also==