The universe is full of amazing things

Matter is our monthly box of intriguing scientific items. We search the planet for interesting forms of matter and send them to your door. A monthly dose of fascination to feed your curiosity.

Want more conversation pieces in your life?  Start building your collection of scientific specimens, artifacts, tools, & curiosities by claiming a box in our next limited batch.

Plus, all subscribers get 10% off all non-subscription orders from our shop.


Heads up: Availability is limited for our next batch

After checking out, you'll be able to view, modify, or pause your membership anytime from your account page.

what you can expect to receive

Real science, no fluff

Everything in a Matter box will have some interesting scientific property. Don't expect t-shirts, plushes, or toys—unless there is something scientifically fascinating about it.

Don't just look smart, be smart

We include informational cards to explain the scientific value of the items you receive and provide a starting point for your own research.

1 box, 1 tree

We're proudly carbon neutral. We plant a tree for every order placed and send you details about it, and all packaging materials are either reusable, recyclable, or compostable.


Each month's boxes are all shipped in the first week of each month. You'll receive our newest items before they are even available in our store.

Interested in a past box? Grab a discounted past box from our vault here.


sign up

By subscribing today, you're claiming a box in next month's limited batch.



When you get your box, take a moment to learn the significance of these items in the universe.



Spread your newfound knowledge to your fellow humans and encourage them to do the same.

Customer Reviews

Based on 149 reviews
S.G. (Virginia, United States)
2nd Box We Have Gotten

So far we LOVE our subscription. Both boxes we have gotten have had some pretty cool and interesting stuff. The first box had FOSSILIZED POOP!!!! What kid isn't going to want to learn about that? By kid I mean me, the 48 year old dad :) hahaha. Love it. Can't wait until the next one comes.

I.V. (Texas, United States)
Love it!

I awaly get excited to open this box to see what im gona learn today

Donna D. (California, United States)
Excellent First Box

I really loved my first box. The items have piqued my interest in studying them more, particularly the fulgurite. I am looking forward to future boxes!

A.S. (Washington, United States)
Unexpected and Rewarding

My son spent an afternoon poring over the information cards, cross-referencing with his own books on elements and fossils, and deciding where to place his items within his collection of antiquities and eccentric items. The sample box was amazing and convinced me that he should have a subscription. This first installment was everything he hoped it would be.

E. (British Columbia, Canada)
Great subscription box

Loved the subscription box I got! Really neat stuff and I liked the cards it came with explaining everything.

D.B. (Massachusetts, United States)
Fantastic box full of surprises for the whole family!

This is really one of the best subscription boxes I've ever had. My kids and I look forward to it arriving so we can add everything to our growing collection and read about all the unique items. You never know what you're going to get but it's all going to be exciting to learn about, handle, and use. It's like getting your own little museum exhibit delivered every month (but none of it's behind glass!). So glad I found out about Stemcell; it's my new go to shop for gifts for my science loving family!

A.E. (Arizona, United States)

Matter Subscription Box

m.d. (Michigan, United States)

partner and i look forward to the next month! both of us being science geeks, it’s a great little reward for both of us.

We love the matter box!

Every single box is so different and completely jam-packed with cool stuff. This was a gift subscription for my husband and it entertained the whole family thoroughly! Highly recommend for science lovers and those new to loving science, alike. It’s so much fun and so informative, each and every time!

J.D. (Pennsylvania, United States)
Amazing Box!

This is such a fun box! I’m not even a super sciency person, but love to learn about the different things that come. And it’s going to make for an amazing collection of items!

some PREVIOUSLY featured items

We've shipped tens of thousands of boxes and counting, making Matter is one of the most popular science-themed subscription boxes, and the only box that features real scientific artifacts, fossils, and specimens. Here are a few of the hundreds of items we've featured.


We work with several labs that create cutting-edge materials for scientific research. One such material was this soil that was engineered to be chemically and physically identical to the surface dust of the moon.


Our laboratory equipment manufacturers provide us with many specialized tools that can be hard to find. Since scientific research demands high precision, you know you're only getting the absolute top-quality research and measurement tools.


Through our network of collectors, we've been able to include many collectible natural specimens in Matter, such as fossils and meteorites, all of which are verified and identified by trusted experts.

These meteorites were likely formed in the early solar system and crashed into earth around 4,500 years ago.


Our scientific artifacts may be our favorite items. These items highlight the extremes of human achievement in various fields, such as this piece of the original cable of the Golden Gate Bridge, one of the most immense engineering projects of all time.


Still have questions? We have a broader FAQ page here that might have the answer. If not, feel free to contact us.