This awesome 680 Pc. Hardwood Building Block Set (Classroom Set) will go great in your classroom! Unit blocks are based on a unit measurement of 1-1/4" giving a uniformity of measure for easy building. Hand-sanded for a smoothly finished hardwood manipulative, also with beveled edges and rounded corners for safety. 29 different shapes in 8 boxes…Basic Unit Block: 5.5in. L x 2.75in. W x 1.25in. D