Large 29-inch x 29-inch nylon coarse mesh bag with a drawstring. The hole size in the mesh is approximately 0.4-0.8 mm in size. Perfect for Brew-In-A-Bag (BIAB) style mashing, partial mashing grains, and cereal mashing grains. Be careful when using with direct heat. It's also great for mashing, steeping, and straining fruit for brandies, or large additions of other items.