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Rock Weights

Dumbbell Mold (40, 60, and 80 lbs)

Dumbbell Mold (40, 60, and 80 lbs)

98 total reviews

Regular price $22.95
Regular price Sale price $22.95
Sale Sold out
Shipping calculated at checkout.

All products will be back in stock soon! Thank you for your patience as we try to keep up with demand.


The process is simple: We ship you an empty container strategically sized to weigh an exact amount once filled with Concrete.  Simply visit your local hardware store and grab some concrete for as low as $5.  Add water, mix, and fill the mold!  Let it cure for 48 hours and you just saved 75% compared to other fitness solutions.

We stand behind our products and we are here to answer any questions you have!  Simple email us at

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Additional Information

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

Does Rebar come with the Molds?

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

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

Made in the USA!

All orders are manufactured in Iowa and shipped from our facility in Minnesota, USA. Orders are shipped within 24-48 hours. You can expect them at your doorstep within 5 business days.


We have a 30-day no questions asked return policy on all items. Orders can be returned within 30 days as long as they are in the same condition as when they were arrived - that means no concrete inside!

To start a return, you can contact us at Please include your order # in the email.

After notifying us via email, simply mail your package to the below address.  

Rock Weights 

2355 Louisiana Ave N, Minneapolis, MN 55427

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

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Built for the gritty.


We ship you an empty container sized to weigh 40, 60, or 80 pounds (80 lbs) once filled of concrete. Built with crack-resistant material, Rock Weights is your low-cost solution to finishing your HOME GYM without sacrificing quality and durability.

Please note: 40 lb molds come with Rebar (inserted down handle). 80 lb molds do NOT require Rebar due to the thickness of the handle and sidebars.


° PERFECTLY sized to weigh 40, 60, 80 LBS

° Crack-Resistant Material

° Insert Rebar down handle for extra durability. (Automatically supplied with all 40 lb molds)

Please note: 60 and 80 lb molds do NOT require a Rebar due to the thickness of the handle and sidebars.


We are here for everyone who doesn't mind getting their hands DIRTY! Now is your chance to save HUNDREDS on expensive dumbbells and HIGH shipping fees. Simply visit your local hardware store and purchase 80 lbs of concrete for less than $5! Add water, mix, and transfer into the mold. That's it!!


Insert a REBAR down the handle for EXTRA SUPPORT! (Rebar automatically supplied with all 40 lb molds). Whether you’re going beast mode in the basement, garage, or backyard, our molds protects your concrete allowing you to snatch, swing or press with no-stress!

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