These blocks are different colors and have numbers on them so that you can easily identify them. The blocks you will be using are shown as color symbols with level numbers next to them, allowing you to easily snap them together to form a circuit.
Used with permission, copyright 2018 Elenco Electronics, Inc. Copyright 2019 Brey Corp. t/a Hobby Works
$6 Flat Rate Shipping. FREE Over $199* Most Orders