Salmon Bay stocks “Standards” in; 4 X, 6 X and 8 X 8 X 16 sizes of Concrete Masonry Units (CMU). These blocks meet ASTM C-90 which is the standard for masonry production specifications in the United States. We also stock ½ block, ½ high, and Bond Beam as well as solids in; 2 X & 4 X 8 X 16. We do not stock split face or retaining wall block.