GOGO Set of 2 Cork Wood Yoga Blocks/Non Slip Cork Yoga Blocks for Support, Balance & Comfort Cork Comes with 2 pcs yoga blocks in the same size Size 3 in: 3 x 6 x 9 inches; Size 4 in: 4 x 6 x 9 inches High-density cork wood material for adding durability. Slip-resistant yoga gear to prevent slipping and offer a heavy, firm and comfortable foundation. Functional yoga blocks helps to provides stability and balance to deeper poses and increase strength, making more difficult poses accessible without over-straining your muscles.