Click-A-Brick Toys Booster Box 16pc - Building Block ADDON Set - Best Educational Gift for Boys and Girls - Gear Kids Up for STEM Learning, Imagination, & Engineering Fun - Create Endless Combinations ADD MORE FUN: Includes 16 of our most popular pieces kids love using more of ADD MORE MOTION: More wheels and more spinners can lead to some imaginative builds ADD MORE LIFE: Extra eye pieces lets your child build more friends for their creations BOOSTER SET ONLY: Comes with 8 spinners, 4 wheels, and 4 eyes. To be used with full Click-A-Brick sets, sold separately 100% SMILE GUARANTEED: If for any reason our toy does not make you or your child smile, we will refund your purchase with no questions asked. Yes, we are that devoted to your happiness! :)