Orders on are typically shipped within 5 – 7 days of placing your order and are charged a flat rate of $7.95 per order. During the holidays, Tenka Labs offers an expedited shipping option of 3 days for $19.95 from November 19 – December 20. Orders placed after December 20th will ship January 2nd. Orders with expedited shipping option must be placed by 11am PST for delivery within 3 days.  


We want you to be delighted with your purchase, but if you're not — you can return it within 15 days and we will happily refund the purchase price. 

To start the process, please write to us at We'll reply via email with an outline of the steps necessary for returning your product.

Once you receive the email, please ship your unused product, in its original packaging, back to us as instructed.

You are responsible for shipping the products back. For your own sanity, we suggest using a trackable shipping method!

Here's the small-print stuff:

  • Returned items must be in unopened, saleable condition, accompanied by the original receipt, in order to be eligible for refund or credit.
  • We can't offer refunds or credit for purchases made through third parties.
  • There are no cash refunds and we do not credit or refund charges for shipping or handling.
  • Returns will be applied to the purchasing credit card within 5 – 10 days of the date that we process it.

We hope that you love your Circuit Cubes, but understand if you need to request a refund. We're always glad to help!

During the holidays, Tenka Labs offers an extended return policy through January 31.


Tenka Labs
48 Paul Drive, Unit #6
San Rafael, CA 94903