Solid Concrete Block, 12" W X 4" H X 16" L

Concrete blocks, also called cinder blocks and cement blocks, come in a wide variety of shapes and sizes. They are made out of a mixture of Portland cement, sand, gravel and water. When the mixture is wet it is paste-like and can be cast into the form of the block. When it dries, it hardens until it becomes like stone.

• 12" wide x 4" high x 16" long solid block
• Sold individually
• 72 blocks per cube
• Available in other sizes
• Meets ASTM C-90 Standards