Dog Rocks Helps Prevent Nasty Burns Saves Your Lawn.
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http://www.amazon.co.uk/Rocks-Helps-Prevent-Nasty-Burns/dp/B000NE2UH4/ref=sr_1_14?ie=UTF8&m=A2SQ9O1Y97U507&s=generic&qid=1305326614&sr=1-14