Corncob socks tackle tough jobs and provide an 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 gal 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 wont need a shovel for this cleanup, They are also approved by the U.S. department of agriculture's (USDA) biopreferred program, a federal purchasing program for biobased products.