CornCob Socks Tackle Tough Jobs and Provide Affordable Alternative to Messy Clay. These economical and highly efficient Socks can tackle even the toughest jobs. With a tough polypropylene skin and finely ground corn cob filler, these Socks absorb 1/2 gallon of oil, coolants, solvents and water - nearly twice as much as clay, but without the dust or the mess to clean up afterward. Plus they're incinerable. Unlike clay, you won't need a shovel for this cleanup!