Before revision: Foam plastic or rubber blocks are lighter than cork, ranging between 200 and 400 grams (7 to 14 ounces), so are convenient to carry around, and they are often inexpensive, so they are widely used by yoga studios.
After revision: (often EVA foam)Foam plastic or rubber blocks are lighter than cork, ranging between 200 and 400 grams (7 to 14 ounces), so are convenient to carry around, and they are often inexpensive, so they are widely used by yoga studios.