Each Gigglespot comes with a 1/2" Velcro (Hook and Loop) fastener on the back. We've made this fastener the "hook" side so it will stick to as many surfaces as possible. Each set of Gigglespots comes with 12" of "loop-side" self-adhesive tape to get you started. If you'd like to order more of the self-adhesive velcro tape, click this link to Amazon for a ton of suggestions.
Keep in mind that you only need the "loop" side of the tape to hang your Gigglespots but it's tricky to find loop-only velcro unless you order a larger quantity.