This block is designed to follow slightly curved or flat panels without digging into the fill material. Hook and Loop attachment for Hook and Loop type paper allows paper to be removed and reused, saving time, money and paper. The block is made of lightweight and durable EVA foam. Can be used for wet or dry sanding. A favorite among the professionals when blocking all surfaces. Exact measurement: 1-1/2" height x 2-5/8" width x 11" length. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.