We believe EVERYONE should be able to afford heavy dumbbells and kettlebells at home!


STEP 1: We ship you an empty container perfectly sized to weigh an exact amount once filled with CONCRETE.

STEP 2: Visit your local hardware store and grab some concrete! 80 lbs of concrete for as low as $4!

STEP 3: Fill the container, let it dry, and you will have a FULLY functional dumbbell or kettlebell!

*Video Tutorial Included

4th of July SALE!!!

Our biggest sale yet.... BOGO 50% OFF SITEWIDE!

(Code: JULYBOGO50)

25 lb Mold is HERE!!

We've officially launched 25 lb Dumbbell and Weight Plate combo!! This might be our most exciting product yet! With its compact size and versatility, it is no surprise that it is already our fasting selling product!

20% Off Launch Special!

Don't just take our word for it... here's actual reviews from hundreds of customers!

Frequently Asked Questions

Do I need experience with Concrete?

Absolutely not. Concrete mix is as simple as Pancake mix. Simply add water, mix, and fill the mold!

Additionally, click here for in-depth tutorial to walk you through the entire process: Tutorial Video

What do I need from the Hardware Store?

The only essential product you need to pick up is Concrete Mix. Here's a link to the most popular option:

Optional helpful products

  • 5 Gallon Bucket
  • Gardening shovel or Concrete trowel
  • Gloves

Does Rebar come with the Mold?

Every 40 lb Dumbbell mold comes with a pre-cut rebar for inserting down the handle. No other mold requires Rebar.

Are the molds sold individually?

Yes. You can buy single dumbbells or you can buy them in a bundle.

What is your Return Policy?

You have 60 days to receive a full refund if you change your mind! Simply send your products back to our warehouse and we will submit a refund immediately upon receipt.

*Please note: Products must be unused. MORE DETAILS HERE.

Now available on Amazon!

You asked. We listened. Now ordering is even easier! Click the link below to order your Rock Weights via Amazon!

Order today!


Make DUMBBELLS and KETTLEBELLS affordable and accessible for ALL!

  • Polycarbonate Materials

  • American Made

  • Patent Pending Design

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Concrete is both affordable and easy to use! You can purchase 80 lbs of concrete mix for as low as $4! Simply pour into a bucket and add water! Click the link below to watch a tutorial walking you through the entire process of finishing your dumbbell and kettlebells!

View Tutorial