STEM Club toys vary each box to include a range of topics and concepts, from chemistry kits to robots and math learning tools. STEM Club items ship for free. You can cancel your STEM Club Toy Subscription anytime in “Your Memberships & Subscriptions”. Subscription begins upon sign-up and will renew automatically every one, two, or three months as applicable (based on the option you select) on the day you signed up or the last day of the month, if the applicable month does not include that day of the month. For each box of your subscription, you will be billed on the date your STEM Club toy ships. Please send us your feedback at STEMClubfeedback@amazon.com