The white mushroom would be far and away the most popular and comes in 4 sizes (button, closed cup, open cup and large). We provide specific Casing for the white Mushroom to customers worldwide. 

About The White Mushroom "Agaricus bisporus"

It would easily be the most common type, the white mushrooms. It range in size from tiny—called button, which are harvested when young and have the mildest flavor—to jumbo, which can be stuffed and baked. Creamy white to pale tan, they have a firm texture and a delicate flavor. Health experts and nutritionists refer to  mushrooms as nature’s nutritional supplement. The White mushrooms is loaded with the nutrients our bodies need to generate energy and repair cells. Thet also include digestive enzymes, a spectrum of B vitamins, protein, and vitamin D2 all naturally occurring. Better for you (as many would say) than any supplement