Red wigglers like shredded cardboard and newspaper. Unfortunately, not many of us get the daily paper and tearing up cardboard is a huge pain. My shredder eats paper and cardboard into a nice fluffy bedding. Old Toms Wormery Bedding includes a generous amount of coffee grounds, spent grains, Azomite for grit, and oyster shell for pH control. You add one gallon of plain water to make a welcoming home for your happy worms.