This set comprises a wooden base with 16 holes in 4 different sizes which are randomly placed. There are 16 rods with 4 different diameters. The child has to fix the rods into the right holes. The child gets a concept of sizes and the activity also improves eye-hand coordination. The child will eventually visually examine a rod and place it in the right slot. Age group - 1.5 years to 2.5 years