The Weight Cylinders develop children's ability to perceive and differentiate weights. This learning toy builds concentration, matching and focusing skills. Children compare the weights of the wooden cylinders with plastic grips to discover a match. Color-coded dots on the bottom allow for self-correction. This educational toy is ideal for the home, preschool or day care center. 10"W x 7.75"D x 2.75"H, individual cylinder- 1.75"Dia. x 2.5"H .