Square Foam Blocks These foam blocks are made of EPS Foam and are square. These blocks are 2" in thickness, and measure either 4"x4", 6"x6", 8"x8", 10"x10", or 12"x12". Each order comes with 6 blocks. Custom orders: each block size length is added to this total and the total cannot exceed the limits listed below. Small Custom Order: total size cannot exceed 36" Medium Custom Order: total size cannot exceed 48" Large Custom Order: total size cannot exceed 60" Example: an order of three 4"x4" blocks and four 8"x8" blocks adds up to 3*4+4*8 = 44, so this order is valid for a medium custom order as the maximum size for a medium custom order is 48". Be careful not to exceed the size limit, or your order may be delayed or cancelled.