Both of these boats -- as were all of them in this competition -- were made of only cardboard, recyclables and duct tape. All paddles had to be made from scratch, and not store-bought.

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Toby Radding, left, and his sister Taylor Radding, 8, of Lafayette, paddle across a pool in their watercraft named "The Cheese Boat!!!" made of
Toby Radding, left, and his sister Taylor Radding, 8, of Lafayette, paddle across a pool in their watercraft named "The Cheese Boat!!!" made of only cardboard, recyclables and duct tape during the Derby Day boat race held at Pleasant Hill Aquatic Park in Pleasant Hill, Calif., on Friday, July 19, 2013. (Doug Duran/Bay Area News Group)


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Cole Erny, 11, left, and his brother Harrison Erny, 13, of Orinda, paddle across a pool in their watercraft named "USS Snappy" made of only
Cole Erny, 11, left, and his brother Harrison Erny, 13, of Orinda, paddle across a pool in their watercraft named "USS Snappy" made of only cardboard, recyclables and duct tape during the Derby Day boat race held at Pleasant Hill Aquatic Park in Pleasant Hill, Calif., on Friday, July 19, 2013. (Doug Duran/Bay Area News Group)