Question: are all yoga blocks the same size?
Answer: These blocks are the most economical choice available. 4-Inch Foam, Marbled Foam, Recycled Foam, Cork, Bamboo, Wood Yoga Blocks: For general use, 4-Inch Yoga Blocks are the standard. The dimensions (4" x 6" x 9") have been found to be the most universally useful for average practitioners.